Trojan.Win32.Swrort_66998f1f88

by malwarelabrobot on July 3rd, 2014 in Malware Descriptions.

Trojan.Win32.Agent.icgh (Kaspersky), Gen:Heur.Minggy.1 (B) (Emsisoft), Gen:Heur.Minggy.1 (AdAware), Trojan.Win32.Swrort.4.FD, TrojanSwrort.YR (Lavasoft MAS)
Behaviour: Trojan


The description has been automatically generated by Lavasoft Malware Analysis System and it may contain incomplete or inaccurate information.

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Summary
Dynamic Analysis
Static Analysis
Network Activity
Map
Strings from Dumps
Removals

MD5: 66998f1f881d0472fea91662ae8b7d3d
SHA1: eab2ba9bc76a1a7e01f797ff08289401d957c12e
SHA256: dc5b231e86f0cac49f172636cd66aec39b63a0358c1c88691eefc4204674f6ad
SSDeep: 12288:P1/aGLDCMNpNAkoSzZWD8ayX2MQCw7D0s4zQ65zvLRGS6vyb7Ty3XQ2g0g2uIEUp:P1/aGLDCM4D8ayGMRzQ65zvLRGS6vybI
Size: 740205 bytes
File type: EXE
Platform: WIN32
Entropy: Packed
PEID: UPolyXv05_v6
Company: no certificate found
Created at: 2014-02-27 08:41:59
Analyzed on: WindowsXP SP3 32-bit


Summary:

Trojan. A program that appears to do one thing but actually does another (a.k.a. Trojan Horse).

Payload

No specific payload has been found.

Process activity

The Trojan creates the following process(es):

%original file name%.exe:480
prnfj.exe:1192

The Trojan injects its code into the following process(es):
No processes have been created.

Mutexes

The following mutexes were created/opened:
No objects were found.

File activity

The process %original file name%.exe:480 makes changes in the file system.
The Trojan creates and/or writes to the following file(s):

%Documents and Settings%\All Users\Application Data\Saaaalamm\Mira.h (537850 bytes)
%Documents and Settings%\All Users\Application Data\prnfj.exe (914498 bytes)

The process prnfj.exe:1192 makes changes in the file system.
The Trojan creates and/or writes to the following file(s):

C:\AUTOEXEC.BAT .exe (1452114 bytes)
C:\MSDOS.SYS .exe (1452114 bytes)
C:\IO.SYS .exe (1452114 bytes)
C:\boot.ini .exe (1452114 bytes)
%Documents and Settings% .exe (1452114 bytes)
C:\RECYCLER .exe (1452114 bytes)
C:\ntldr .exe (1452114 bytes)
C:\%original file name%.exe .exe (1452114 bytes)
C:\original .exe (1452114 bytes)
C:\totalcmd .exe (1452114 bytes)
C:\NTDETECT.COM .exe (1452114 bytes)
C:\System Volume Information .exe (1452114 bytes)
C:\CONFIG.SYS .exe (1452114 bytes)
C:\marker .exe (1452114 bytes)
%Program Files% .exe (1452114 bytes)
%WinDir% .exe (1452114 bytes)
C:\pagefile.sys .exe (1452114 bytes)

The Trojan deletes the following file(s):

C:\Mirax (0 bytes)
C:\Mirat (0 bytes)
C:\Mirau (0 bytes)
C:\Mirav (0 bytes)
C:\Miraw (0 bytes)
C:\Mirap (0 bytes)
C:\Miraq (0 bytes)
C:\Miram (0 bytes)
C:\Mirao (0 bytes)
C:\Mirai (0 bytes)
C:\Miraj (0 bytes)
C:\Mirak (0 bytes)
C:\Mirad (0 bytes)
C:\Mirae (0 bytes)
C:\Miraf (0 bytes)
C:\Miraa (0 bytes)

Registry activity

The process %original file name%.exe:480 makes changes in the system registry.
The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "A7 D6 9F 74 AB 79 47 B7 5E F5 47 89 C5 23 BC EB"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd72-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{b98117e8-75ca-11e2-81b2-000c293708fb}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd75-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

The process prnfj.exe:1192 makes changes in the system registry.
The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"

To automatically run itself each time Windows is booted, the Trojan adds the following link to its file to the system registry autorun key:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"Microsoft® Windows® Operating System" = "%Documents and Settings%\All Users\Application Data\prnfj.exe"

Dropped PE files

MD5 File path
3cedde8a2fe3c2a577d8bcba7a517312 c:\%original file name%.exe .exe
c4edd60cb7b6f7737b25f1181277cc7a c:\AUTOEXEC.BAT .exe
3fd75215d2d87d08eafc8ba79909c081 c:\CONFIG.SYS .exe
484940674ecb2267d1867eb3eda68bac c:\Documents and Settings .exe
15cccb964efeeb58f9cd8ebf5757b3a1 c:\Documents and Settings\All Users\Application Data\Saaaalamm\Mira.h
428fc5ea1ba62d0e219dbc0ded5b9346 c:\Documents and Settings\All Users\Application Data\prnfj.exe
8a1b94ad33babfc2068582e299609575 c:\IO.SYS .exe
cb84dd572e500f9cbae397dae08b1e27 c:\MSDOS.SYS .exe
4f4fa2db763ca5bd072938e5d74f338c c:\NTDETECT.COM .exe
881c50003f075ce6cfb4af6cc8ef08e1 c:\Perl .exe
a507973a603b9b2210f4d2b4891894d4 c:\Program Files .exe
6fe3552533d45a809722b5c62fca383c c:\RECYCLER .exe
049193b060112f219afa39875597bf4b c:\System Volume Information .exe
3e12094dd83af6ba8f56998dc448f93c c:\WINDOWS .exe
99726d9d187986c5a58b9fb047389f2a c:\boot.ini .exe
97595c119ef5027360575c9250d283b7 c:\marker .exe
52593d1f14be0e64cc727f48ad95fda8 c:\ntldr .exe
b40d53d6956a60a30aaee678bace4398 c:\original .exe
52d37e59499040c76fd254517a9fb693 c:\pagefile.sys .exe
1d3dbced79a3f7edf045af53464a6316 c:\totalcmd .exe

HOSTS file anomalies

No changes have been detected.

Rootkit activity

No anomalies have been detected.

Propagation

VersionInfo

No information is available.

PE Sections

Name Virtual Address Virtual Size Raw Size Entropy Section MD5
.text 4096 245368 245760 4.21465 8b164ac8ef3742f37830dc1842275667
.data 249856 608 1024 0.488703 6fda88cf7188a8245a53dfde927250fd
.rdata 253952 9384 9728 3.47165 dbe852009dbd077a9976cb0ecfb9aadf
.bss 266240 18576 0 0 d41d8cd98f00b204e9800998ecf8427e
.idata 286720 2212 2560 2.97703 5e5242c565219f3bd33a6568632559dc
.rsrc 290816 26552 26624 4.33984 021ada86e2e786336d7040d417cd33fd

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

Total found: 1
686ae5b695ac42b6dcee54d9d78cf7c0

URLs

No activity has been detected.

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

Web Traffic was not found.

The Trojan connects to the servers at the folowing location(s):

prnfj.exe_1192:

.text
`.data
.rdata
@.bss
.idata
%Documents and Settings%\All Users\Application Data\prnfj.exe
Software\Microsoft\Windows\CurrentVersion\Run
Windows
Operating System
%H:%M:%S
%m/%d/%y
-0123456789
%s:%u: failed assertion `%s'
RegCloseKey
RegOpenKeyA
ADVAPI32.DLL
KERNEL32.dll
msvcrt.dll
SHELL32.DLL


Remove it with Ad-Aware

  1. Click (here) to download and install Ad-Aware Free Antivirus.
  2. Update the definition files.
  3. Run a full scan of your computer.


Manual removal*

  1. Terminate malicious process(es) (How to End a Process With the Task Manager):

    %original file name%.exe:480
    prnfj.exe:1192

  2. Delete the original Trojan file.
  3. Delete or disinfect the following files created/modified by the Trojan:

    %Documents and Settings%\All Users\Application Data\Saaaalamm\Mira.h (537850 bytes)
    %Documents and Settings%\All Users\Application Data\prnfj.exe (914498 bytes)
    C:\AUTOEXEC.BAT .exe (1452114 bytes)
    C:\MSDOS.SYS .exe (1452114 bytes)
    C:\IO.SYS .exe (1452114 bytes)
    C:\boot.ini .exe (1452114 bytes)
    %Documents and Settings% .exe (1452114 bytes)
    C:\RECYCLER .exe (1452114 bytes)
    C:\ntldr .exe (1452114 bytes)
    C:\%original file name%.exe .exe (1452114 bytes)
    C:\original .exe (1452114 bytes)
    C:\totalcmd .exe (1452114 bytes)
    C:\NTDETECT.COM .exe (1452114 bytes)
    C:\System Volume Information .exe (1452114 bytes)
    C:\CONFIG.SYS .exe (1452114 bytes)
    C:\marker .exe (1452114 bytes)
    %Program Files% .exe (1452114 bytes)
    %WinDir% .exe (1452114 bytes)
    C:\pagefile.sys .exe (1452114 bytes)

  4. Delete the following value(s) in the autorun key (How to Work with System Registry):

    [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
    "Microsoft® Windows® Operating System" = "%Documents and Settings%\All Users\Application Data\prnfj.exe"

*Manual removal may cause unexpected system behaviour and should be performed at your own risk.