Analysis

  • max time kernel
    36s
  • max time network
    98s
  • platform
    windows7_x64
  • resource
    win7-20221111-en
  • resource tags

    arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
  • submitted
    25-01-2023 20:32

General

  • Target

    4385abb8f1ffbb6ad3953295892730b8.exe

  • Size

    1018KB

  • MD5

    4385abb8f1ffbb6ad3953295892730b8

  • SHA1

    34c74d4ee9850a36e746747022756834fdaa518a

  • SHA256

    cf496576e970c84e62e2e66d2c7d27339914d32087e9877aa4fe2cd2bf21255e

  • SHA512

    1cc2fdccc302aad4b5a4668bca85043d45871c702811765946e76c3dca10c15c5b4598318e0d383d4e8db4dbe36d2e448978367ebe329268ab699c00e11da3d3

  • SSDEEP

    24576:ik+b1V8TTyGainaKNH+TH3tPIhcvz+HQei8RtDUr:qfK2inbp+BPG4KweLjDU

Malware Config

Signatures

  • Detect PureCrypter injector 1 IoCs
  • PureCrypter

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

  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Looks up external IP address via web service 2 IoCs

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

  • 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
  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\4385abb8f1ffbb6ad3953295892730b8.exe
    "C:\Users\Admin\AppData\Local\Temp\4385abb8f1ffbb6ad3953295892730b8.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1700
    • 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:1384
    • C:\Users\Admin\AppData\Local\Temp\4385abb8f1ffbb6ad3953295892730b8.exe
      C:\Users\Admin\AppData\Local\Temp\4385abb8f1ffbb6ad3953295892730b8.exe
      2⤵
      • Accesses Microsoft Outlook profiles
      • Checks processor information in registry
      • Modifies system certificate store
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      • outlook_office_path
      • outlook_win_path
      PID:1796
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1796 -s 1896
        3⤵
        • Program crash
        PID:2032

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

Credential Access

Credentials in Files

1
T1081

Discovery

System Information Discovery

2
T1082

Query Registry

1
T1012

Collection

Data from Local System

1
T1005

Email Collection

1
T1114

Command and Control

Web Service

1
T1102

Replay Monitor

Loading Replay Monitor...

Downloads

  • memory/1384-58-0x0000000000000000-mapping.dmp
  • memory/1384-60-0x000000006E7F0000-0x000000006ED9B000-memory.dmp
    Filesize

    5.7MB

  • memory/1384-61-0x000000006E7F0000-0x000000006ED9B000-memory.dmp
    Filesize

    5.7MB

  • memory/1384-62-0x000000006E7F0000-0x000000006ED9B000-memory.dmp
    Filesize

    5.7MB

  • memory/1700-54-0x0000000001190000-0x0000000001294000-memory.dmp
    Filesize

    1.0MB

  • memory/1700-55-0x00000000047E0000-0x00000000048E4000-memory.dmp
    Filesize

    1.0MB

  • memory/1700-56-0x0000000004C10000-0x0000000004CA2000-memory.dmp
    Filesize

    584KB

  • memory/1700-57-0x0000000075671000-0x0000000075673000-memory.dmp
    Filesize

    8KB

  • memory/1796-63-0x0000000000400000-0x00000000004C2000-memory.dmp
    Filesize

    776KB

  • memory/1796-64-0x0000000000400000-0x00000000004C2000-memory.dmp
    Filesize

    776KB

  • memory/1796-66-0x0000000000400000-0x00000000004C2000-memory.dmp
    Filesize

    776KB

  • memory/1796-67-0x0000000000400000-0x00000000004C2000-memory.dmp
    Filesize

    776KB

  • memory/1796-68-0x0000000000400000-0x00000000004C2000-memory.dmp
    Filesize

    776KB

  • memory/1796-69-0x00000000004BD5EE-mapping.dmp
  • memory/1796-71-0x0000000000400000-0x00000000004C2000-memory.dmp
    Filesize

    776KB

  • memory/1796-73-0x0000000000400000-0x00000000004C2000-memory.dmp
    Filesize

    776KB

  • memory/1796-75-0x0000000000C30000-0x0000000000C3E000-memory.dmp
    Filesize

    56KB

  • memory/1796-76-0x0000000008AD0000-0x0000000008B82000-memory.dmp
    Filesize

    712KB

  • memory/2032-77-0x0000000000000000-mapping.dmp