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TROJ_SHARIK.CHVR

December 12, 2016
 Analysis by: Byron Jon Gelera
 ALIASES:

Win32/TrojanDownloader.Zurgop.AV (ESET-NOD32); TrojanDownloader:Win32/Dofoil.R (Microsoft)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any propagation routine.

It does not have any backdoor routine.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

41,984 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

30 Jul 2013

Payload:

Connects to URLs/IPs

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan adds the following processes:

  • svchost.exe

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • hashed computer name and volume serial number

It injects codes into the following process(es):

  • created svchost.exe

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Other Details

This Trojan connects to the following URL(s) to check for an Internet connection:

  • http://windowsupdate.microsoft.com

It does the following:

  • It performs several checks before performing its malicious routines:
    • The following flags of its PEB structure must not indicate that it is being debugged:
      • IsDebugging
      • NtGlobalFlag
    • Module filename must not contain the string “sample"
    • Volume serial number should not be:
      • 0xCD1A40 (ThreatExpert
    • Registry data under HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Disk\Enum must not contain the following strings:
      • qemu
      • virtual
      • vmware
    • The following modules should not be loaded:
      • dbghelp
      • sbiedll

It deletes the initially executed copy of itself

NOTES:

It connects to certain websites to send and receive information:

http://{BLOCKED}linker.biz/tmpp2/index.php

It sends the following HTTP request to report status of infection:

  • cmd={getload or grab or getproxy}
  • login={hashed computer name and volume serial number}
  • bits={0 or 1}
  • file={value}
  • run=ok
  • run=fail
  • sel={seller name/bot ID}
  • ver={OS version}
  • doubles=1
  • personal=ok
  • removed=ok
  • admin={0 or 1}
  • hash={value}

    • However, it is inaccessible.

      SOLUTION

    Minimum Scan Engine:

    9.800

    FIRST VSAPI PATTERN FILE:

    12.950.03

    FIRST VSAPI PATTERN DATE:

    09 Dec 2016

    VSAPI OPR PATTERN File:

    12.951.00

    VSAPI OPR PATTERN Date:

    10 Dec 2016

    Step 1

    Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

    Step 2

    Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

    Step 3

    Restart in Safe Mode

    [ Learn More ]

    Step 4

    Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_SHARIK.CHVR. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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