Analysis

  • max time kernel
    153s
  • max time network
    180s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    08-05-2022 05:54

General

  • Target

    3c8bd18b6c4245a7a6279de001da2ae03504a0060e9b61378836dbaf9d6d940e.exe

  • Size

    94KB

  • MD5

    8d63b4b33f84d55f999fe7f2c07f1898

  • SHA1

    4b72592eb314d60c52e7dc13a4c99b5afb902bf3

  • SHA256

    3c8bd18b6c4245a7a6279de001da2ae03504a0060e9b61378836dbaf9d6d940e

  • SHA512

    d734614ccba6dd7f3e84e5a39484a45bead737f3d27ab7dbc62654c5a7ea96133c68b02f0e63a073e29105a05ebd2120dd2156d63c901eabad096c65a0e7f263

Malware Config

Extracted

Family

systembc

C2

sdadvert197.com:4044

mexstat128.com:4044

Signatures

  • SystemBC

    SystemBC is a proxy and remote administration tool first seen in 2019.

  • suricata: ET MALWARE Observed SystemBC CnC Domain in DNS Query

    suricata: ET MALWARE Observed SystemBC CnC Domain in DNS Query

  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 4 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Uses Tor communications 1 TTPs

    Malware can proxy its traffic through Tor for more anonymity.

  • Drops file in Windows directory 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of WriteProcessMemory 4 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\3c8bd18b6c4245a7a6279de001da2ae03504a0060e9b61378836dbaf9d6d940e.exe
    "C:\Users\Admin\AppData\Local\Temp\3c8bd18b6c4245a7a6279de001da2ae03504a0060e9b61378836dbaf9d6d940e.exe"
    1⤵
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    PID:1668
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {A7979D5F-0711-46B1-A203-637D0A0A55B5} S-1-5-18:NT AUTHORITY\System:Service:
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:952
    • C:\ProgramData\sgnrhh\avod.exe
      C:\ProgramData\sgnrhh\avod.exe start
      2⤵
      • Executes dropped EXE
      PID:1148

Network

MITRE ATT&CK Matrix ATT&CK v6

Command and Control

Connection Proxy

1
T1090

Replay Monitor

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Downloads

  • C:\ProgramData\sgnrhh\avod.exe
    Filesize

    94KB

    MD5

    8d63b4b33f84d55f999fe7f2c07f1898

    SHA1

    4b72592eb314d60c52e7dc13a4c99b5afb902bf3

    SHA256

    3c8bd18b6c4245a7a6279de001da2ae03504a0060e9b61378836dbaf9d6d940e

    SHA512

    d734614ccba6dd7f3e84e5a39484a45bead737f3d27ab7dbc62654c5a7ea96133c68b02f0e63a073e29105a05ebd2120dd2156d63c901eabad096c65a0e7f263

  • C:\ProgramData\sgnrhh\avod.exe
    Filesize

    94KB

    MD5

    8d63b4b33f84d55f999fe7f2c07f1898

    SHA1

    4b72592eb314d60c52e7dc13a4c99b5afb902bf3

    SHA256

    3c8bd18b6c4245a7a6279de001da2ae03504a0060e9b61378836dbaf9d6d940e

    SHA512

    d734614ccba6dd7f3e84e5a39484a45bead737f3d27ab7dbc62654c5a7ea96133c68b02f0e63a073e29105a05ebd2120dd2156d63c901eabad096c65a0e7f263

  • memory/1148-60-0x0000000000000000-mapping.dmp
  • memory/1148-62-0x0000000001118000-0x000000000111F000-memory.dmp
    Filesize

    28KB

  • memory/1148-64-0x0000000001118000-0x000000000111F000-memory.dmp
    Filesize

    28KB

  • memory/1148-65-0x0000000000400000-0x0000000000F75000-memory.dmp
    Filesize

    11.5MB

  • memory/1668-54-0x00000000002C8000-0x00000000002CF000-memory.dmp
    Filesize

    28KB

  • memory/1668-55-0x0000000075371000-0x0000000075373000-memory.dmp
    Filesize

    8KB

  • memory/1668-56-0x00000000002C8000-0x00000000002CF000-memory.dmp
    Filesize

    28KB

  • memory/1668-57-0x0000000000020000-0x0000000000029000-memory.dmp
    Filesize

    36KB

  • memory/1668-58-0x0000000000400000-0x0000000000F75000-memory.dmp
    Filesize

    11.5MB