Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    02-01-2021 17:33

General

  • Target

    sD4Q5TaU.exe

  • Size

    23KB

  • MD5

    c6666ce354062eaa6b64b7e67daa2968

  • SHA1

    40982aa18aa268abf9d61e544563841ff86cbf38

  • SHA256

    0cd1428ac5c9ef16fdc50458faac098457e93027f54eb011d04b74b944f67f67

  • SHA512

    b4cc5a6aa3f56b71bce993ab78ce82eaffd4aa40347672d0a019a1ea40e72bcdba2fedf79a8ee750e9de1c5452f8a6f429c4a2f186075c7710df8e5d1f98eb70

Malware Config

Extracted

Family

njrat

Version

Blue

Botnet

AntiBot

C2

anti.kro.kr:7

Mutex

bd8a83ed8b02d3c995a02f159f9c2953

Attributes
  • reg_key

    bd8a83ed8b02d3c995a02f159f9c2953

  • splitter

    |'|'|

Signatures

  • njRAT/Bladabindi

    Widely used RAT written in .NET.

  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs
  • Drops startup file 2 IoCs
  • Loads dropped DLL 1 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious use of AdjustPrivilegeToken 31 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\sD4Q5TaU.exe
    "C:\Users\Admin\AppData\Local\Temp\sD4Q5TaU.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:1916
    • C:\Users\Admin\AppData\Local\Temp\csrss.exe
      "C:\Users\Admin\AppData\Local\Temp\csrss.exe"
      2⤵
      • Executes dropped EXE
      • Drops startup file
      • Adds Run key to start application
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1584
      • C:\Windows\SysWOW64\netsh.exe
        netsh firewall add allowedprogram "C:\Users\Admin\AppData\Local\Temp\csrss.exe" "csrss.exe" ENABLE
        3⤵
          PID:1760

    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

    System Information Discovery

    1
    T1082

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\csrss.exe
      MD5

      c6666ce354062eaa6b64b7e67daa2968

      SHA1

      40982aa18aa268abf9d61e544563841ff86cbf38

      SHA256

      0cd1428ac5c9ef16fdc50458faac098457e93027f54eb011d04b74b944f67f67

      SHA512

      b4cc5a6aa3f56b71bce993ab78ce82eaffd4aa40347672d0a019a1ea40e72bcdba2fedf79a8ee750e9de1c5452f8a6f429c4a2f186075c7710df8e5d1f98eb70

    • C:\Users\Admin\AppData\Local\Temp\csrss.exe
      MD5

      c6666ce354062eaa6b64b7e67daa2968

      SHA1

      40982aa18aa268abf9d61e544563841ff86cbf38

      SHA256

      0cd1428ac5c9ef16fdc50458faac098457e93027f54eb011d04b74b944f67f67

      SHA512

      b4cc5a6aa3f56b71bce993ab78ce82eaffd4aa40347672d0a019a1ea40e72bcdba2fedf79a8ee750e9de1c5452f8a6f429c4a2f186075c7710df8e5d1f98eb70

    • \Users\Admin\AppData\Local\Temp\csrss.exe
      MD5

      c6666ce354062eaa6b64b7e67daa2968

      SHA1

      40982aa18aa268abf9d61e544563841ff86cbf38

      SHA256

      0cd1428ac5c9ef16fdc50458faac098457e93027f54eb011d04b74b944f67f67

      SHA512

      b4cc5a6aa3f56b71bce993ab78ce82eaffd4aa40347672d0a019a1ea40e72bcdba2fedf79a8ee750e9de1c5452f8a6f429c4a2f186075c7710df8e5d1f98eb70

    • memory/1584-3-0x0000000000000000-mapping.dmp
    • memory/1760-6-0x0000000000000000-mapping.dmp