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TrojanDropper:Win32/Sengig.A


First posted on 27 October 2016.
Source: Microsoft

Aliases :

There are no other names known for TrojanDropper:Win32/Sengig.A.

Explanation :

Installation
This threat can create files on your PC, including:

  • %TEMP%\rarsfx0\aa_v3.5.exe
  • %TEMP%\rarsfx0\hdskibt.exe
  • \lscshostpolicy.exe


It can make various registry changes during its installation, including:

In subkey: HKLM\SOFTWARE\Ammyy\Admin

Sets value: "hr"
With data: "53 7d 56 73 66 31 3a 82 72 e8 cf cc ad 52 s}vsf1:.rèïì­r"

Sets value: "hr3"
With data: "50 0c 1a 71 52 49 11 65 08 93 5a 5b c6 fa e3 68 p..qri.e..z[æúãh#R##N#8e 83 48 c0 6c f9 a3 af f9 09 32 67 b1 6d 3d d6 ..hàlù£¯ù.2g±m=ö#R##N#1a ee cf e6 31 48 b4 69 2f fa c0 fc 2b ad 1a 79 .îïæ1h´i/úàü+­.y#R##N#64 f3 9c 38 cf 98 de 00 dc 20 20 21 85 fc 29 8f dó.8ï.þ.ü !.ü).#R##N#cd df 14 90 4d 2c 4e af 4c 13 84 24 ee 0a ae 10 íß..m,n¯l..$î.®.#R##N#7d af cd 9a 0f 3d ad 39 5f 3a 2e dc 32 40 59 1b }¯í..=­9_:.ü2@y.#R##N#8b 93 f4 e9 99 3b 90 28 58 e8 15 44 40 f9 "

The malware uses code injection to make it harder to detect and remove. It can inject code into running processes.

Payload

Installs malware or unwanted software

This trojan can install other malware or unwanted software onto your PC.

Connects to a remote host

We have seen this threat connect to a remote host, including:
  • rl.ammyy.com using port 80
Malware can connect to a remote host to do any of the following:
  • Check for an Internet connection
  • Download and run files (including updates or other malware)
  • Report a new infection to its author
  • Receive configuration or other data
  • Receive instructions from a malicious hacker
  • Search for your PC location
  • Upload information taken from your PC
  • Validate a digital certificate


Additional information

Creates a mutex

This threat can create one or more mutexes on your PC. For example:
  • ASP.NET_Perf_Library_Lock_PID_a10
  • BITS_Perf_Library_Lock_PID_a10
  • ESENT_Perf_Library_Lock_PID_a10
  • Lsa_Perf_Library_Lock_PID_a10
  • MSDTC_Perf_Library_Lock_PID_a10
  • PerfOS_Perf_Library_Lock_PID_a10
  • Spooler_Perf_Library_Lock_PID_a10
  • TapiSrv_Perf_Library_Lock_PID_a10
  • Tcpip_Perf_Library_Lock_PID_a10
  • usbhub_Perf_Library_Lock_PID_a10


It might use this mutex as an infection marker to prevent more than one copy of the threat running on your PC.

This malware description was published using automated analysis of file SHA1 8bf0cdad4a9db240e5aa03c1a08ca82142e5a941.

Last update 27 October 2016

 

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