Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    25-01-2023 11:31

General

  • Target

    c0dbbc6e77a3b9cdad5563e7c814e053.exe

  • Size

    37KB

  • MD5

    c0dbbc6e77a3b9cdad5563e7c814e053

  • SHA1

    c814d27d1c1e7963c7d3ba533025918d70fc1ef2

  • SHA256

    62723ed12c72ceb21bc77c63811f58ab082b36bd8487531d8b52e4de5030c7f1

  • SHA512

    7f6bd0194165cc713a35139f1a342fe3150d0b53996985d8cb487b1c1cd9ea352d2d21941bd9f26920f73953185d814c9c95e976b82ccd1cd66fb50e6258364a

  • SSDEEP

    384:OA0GK3hUidkcXR21cGMy8P4E5fXUFl6M0lrAF+rMRTyN/0L+EcoinblneHQM3ep:R0GK3rLGv8P4E58qMorM+rMRa8Nunmt

Malware Config

Extracted

Family

njrat

Version

im523

Botnet

HacKed

C2

104.22.32.240:443

Mutex

a1d3fe53d6645a42400095b4adec79f5

Attributes
  • reg_key

    a1d3fe53d6645a42400095b4adec79f5

  • splitter

    |'|'|

Signatures

  • njRAT/Bladabindi

    Widely used RAT written in .NET.

  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops startup file 2 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Drops file in Windows directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Kills process with taskkill 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 36 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c0dbbc6e77a3b9cdad5563e7c814e053.exe
    "C:\Users\Admin\AppData\Local\Temp\c0dbbc6e77a3b9cdad5563e7c814e053.exe"
    1⤵
    • Checks computer location settings
    • Drops file in Windows directory
    • Suspicious use of WriteProcessMemory
    PID:4160
    • C:\Windows\server.exe
      "C:\Windows\server.exe"
      2⤵
      • Executes dropped EXE
      • Drops startup file
      • Adds Run key to start application
      • Drops file in Windows directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1584
      • C:\Windows\SysWOW64\netsh.exe
        netsh firewall add allowedprogram "C:\Windows\server.exe" "server.exe" ENABLE
        3⤵
        • Modifies Windows Firewall
        PID:3868
      • C:\Windows\SysWOW64\taskkill.exe
        taskkill /F /IM Exsample.exe
        3⤵
        • Kills process with taskkill
        • Suspicious use of AdjustPrivilegeToken
        PID:4724

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Modify Existing Service

1
T1031

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

1
T1112

Discovery

Query Registry

1
T1012

System Information Discovery

2
T1082

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Windows\server.exe
    Filesize

    37KB

    MD5

    c0dbbc6e77a3b9cdad5563e7c814e053

    SHA1

    c814d27d1c1e7963c7d3ba533025918d70fc1ef2

    SHA256

    62723ed12c72ceb21bc77c63811f58ab082b36bd8487531d8b52e4de5030c7f1

    SHA512

    7f6bd0194165cc713a35139f1a342fe3150d0b53996985d8cb487b1c1cd9ea352d2d21941bd9f26920f73953185d814c9c95e976b82ccd1cd66fb50e6258364a

  • C:\Windows\server.exe
    Filesize

    37KB

    MD5

    c0dbbc6e77a3b9cdad5563e7c814e053

    SHA1

    c814d27d1c1e7963c7d3ba533025918d70fc1ef2

    SHA256

    62723ed12c72ceb21bc77c63811f58ab082b36bd8487531d8b52e4de5030c7f1

    SHA512

    7f6bd0194165cc713a35139f1a342fe3150d0b53996985d8cb487b1c1cd9ea352d2d21941bd9f26920f73953185d814c9c95e976b82ccd1cd66fb50e6258364a

  • memory/1584-133-0x0000000000000000-mapping.dmp
  • memory/1584-137-0x0000000074B90000-0x0000000075141000-memory.dmp
    Filesize

    5.7MB

  • memory/1584-140-0x0000000074B90000-0x0000000075141000-memory.dmp
    Filesize

    5.7MB

  • memory/3868-138-0x0000000000000000-mapping.dmp
  • memory/4160-132-0x0000000074B90000-0x0000000075141000-memory.dmp
    Filesize

    5.7MB

  • memory/4160-136-0x0000000074B90000-0x0000000075141000-memory.dmp
    Filesize

    5.7MB

  • memory/4724-139-0x0000000000000000-mapping.dmp