Analysis

  • max time kernel
    45s
  • max time network
    169s
  • platform
    windows7_x64
  • resource
    win7-20221111-en
  • resource tags

    arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
  • submitted
    25-01-2023 22:23

General

  • Target

    cd7c2065e6fd3d81d85b8eb62c828292c291703d5dcde7511f3ae2c2c53e738c.exe

  • Size

    2.4MB

  • MD5

    a61ca48da85a9ca93ca3e2b846f49603

  • SHA1

    e76f6120f4fee7fbee5243c9e3aa53c65cc3acbf

  • SHA256

    cd7c2065e6fd3d81d85b8eb62c828292c291703d5dcde7511f3ae2c2c53e738c

  • SHA512

    24aa2c189e1420ec6fc82a9e1e3e0a0a186f238758c2decabac950e8b08a305e306eacbe544eaf7dbeb2b7080f99ff0ad2c6f573f7262a13b11a549e0ae8511d

  • SSDEEP

    49152:qfFfLewfpME45GDDqvI/Nd1xVovNyNqy3h3aiKT0wtKXtycqm2vfOtI:OFKwR25GDDr1sNyAyg/titynB3Oa

Malware Config

Signatures

  • Detect PureCrypter injector 1 IoCs
  • PureCrypter

    PureCrypter is a .NET malware loader first seen in early 2021.

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 1 IoCs
  • Modifies system certificate store 2 TTPs 6 IoCs
  • Suspicious behavior: EnumeratesProcesses 21 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 17 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\cd7c2065e6fd3d81d85b8eb62c828292c291703d5dcde7511f3ae2c2c53e738c.exe
    "C:\Users\Admin\AppData\Local\Temp\cd7c2065e6fd3d81d85b8eb62c828292c291703d5dcde7511f3ae2c2c53e738c.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:840
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1488
    • C:\Users\Admin\AppData\Local\Temp\cd7c2065e6fd3d81d85b8eb62c828292c291703d5dcde7511f3ae2c2c53e738c.exe
      C:\Users\Admin\AppData\Local\Temp\cd7c2065e6fd3d81d85b8eb62c828292c291703d5dcde7511f3ae2c2c53e738c.exe
      2⤵
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1908
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1908 -s 1576
        3⤵
        • Program crash
        PID:1360

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

2
T1112

Install Root Certificate

1
T1130

Discovery

System Information Discovery

1
T1082

Replay Monitor

Loading Replay Monitor...

Downloads

  • memory/840-55-0x0000000004C10000-0x0000000004E80000-memory.dmp
    Filesize

    2.4MB

  • memory/840-61-0x0000000004AE0000-0x0000000004B32000-memory.dmp
    Filesize

    328KB

  • memory/840-54-0x00000000008E0000-0x0000000000B50000-memory.dmp
    Filesize

    2.4MB

  • memory/1360-76-0x0000000000000000-mapping.dmp
  • memory/1488-56-0x0000000000000000-mapping.dmp
  • memory/1488-57-0x0000000075FF1000-0x0000000075FF3000-memory.dmp
    Filesize

    8KB

  • memory/1488-58-0x000000006F010000-0x000000006F5BB000-memory.dmp
    Filesize

    5.7MB

  • memory/1488-59-0x000000006F010000-0x000000006F5BB000-memory.dmp
    Filesize

    5.7MB

  • memory/1488-60-0x000000006F010000-0x000000006F5BB000-memory.dmp
    Filesize

    5.7MB

  • memory/1908-62-0x0000000000400000-0x000000000041C000-memory.dmp
    Filesize

    112KB

  • memory/1908-65-0x0000000000400000-0x000000000041C000-memory.dmp
    Filesize

    112KB

  • memory/1908-66-0x0000000000400000-0x000000000041C000-memory.dmp
    Filesize

    112KB

  • memory/1908-67-0x0000000000400000-0x000000000041C000-memory.dmp
    Filesize

    112KB

  • memory/1908-68-0x000000000041612E-mapping.dmp
  • memory/1908-70-0x0000000000400000-0x000000000041C000-memory.dmp
    Filesize

    112KB

  • memory/1908-72-0x0000000000400000-0x000000000041C000-memory.dmp
    Filesize

    112KB

  • memory/1908-73-0x0000000000390000-0x000000000039A000-memory.dmp
    Filesize

    40KB

  • memory/1908-74-0x00000000003D0000-0x00000000003F6000-memory.dmp
    Filesize

    152KB

  • memory/1908-63-0x0000000000400000-0x000000000041C000-memory.dmp
    Filesize

    112KB