Analysis

  • max time kernel
    145s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-02-2023 13:19

General

  • Target

    CRM_chat/CRM_chat_laucnher.exe

  • Size

    677.7MB

  • MD5

    e0e15d15df5f199a4a598179ef38efc4

  • SHA1

    c8f9954db05274eb0efc97a9bc6d062abba4bbbe

  • SHA256

    8a1e48fb5bdf53c3ad86c7c2adaacfce682c6088b00af99558601e7cd1e08766

  • SHA512

    59f03df492b6b93ecf97361e34eeae6f17e25dc3cc348667a72c87e56e65bebb1fbd6a20c7c9fc92e6f30bd73ecae3f5b71c8884837785208d54d8c13600d56b

  • SSDEEP

    1536:Krae78zjORCDGwfdCSog01313Vs5gChkD7OMYVG:CahKyd2n31S5veOK

Malware Config

Extracted

Family

purecrypter

C2

https://knickglobal.com/wp-admin/images/css/design/fabric/bo/Odcny.dll

Signatures

  • PureCrypter

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

  • Blocklisted process makes network request 2 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

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

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

  • Checks processor information in registry 2 TTPs 47 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of WriteProcessMemory 49 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\CRM_chat\CRM_chat_laucnher.exe
    "C:\Users\Admin\AppData\Local\Temp\CRM_chat\CRM_chat_laucnher.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of WriteProcessMemory
    PID:3672
    • C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\setup_ov2.exe
      C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\setup_ov2.exe
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Suspicious use of SetThreadContext
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:5064
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMwA1AA==
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:4672
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c powershell -ENC cwBlAHQALQBtAHAAcAByAGUAZgBlAHIAZQBuAGMAZQAgAC0AZQB4AGMAbAB1AHMAaQBvAG4AcABhAHQAaAAgAEMAOgBcAA==
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3124
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          powershell -ENC cwBlAHQALQBtAHAAcAByAGUAZgBlAHIAZQBuAGMAZQAgAC0AZQB4AGMAbAB1AHMAaQBvAG4AcABhAHQAaAAgAEMAOgBcAA==
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:1808
      • C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\setup_ov2.exe
        C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\setup_ov2.exe
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Checks processor information in registry
        • Suspicious use of WriteProcessMemory
        PID:4876
        • C:\Windows\SysWOW64\rundll32.exe
          "C:\Windows\syswow64\rundll32.exe" "C:\Windows\syswow64\shell32.dll",#61
          4⤵
          • Blocklisted process makes network request
          PID:3240
        • C:\Windows\SysWOW64\rundll32.exe
          "C:\Windows\syswow64\rundll32.exe" "C:\Windows\syswow64\shell32.dll",#61
          4⤵
          • Blocklisted process makes network request
          • Checks processor information in registry
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of FindShellTrayWindow
          PID:1332

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

1
T1112

Discovery

Query Registry

2
T1012

System Information Discovery

3
T1082

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log
    Filesize

    1KB

    MD5

    4280e36a29fa31c01e4d8b2ba726a0d8

    SHA1

    c485c2c9ce0a99747b18d899b71dfa9a64dabe32

    SHA256

    e2486a1bdcba80dad6dd6210d7374bd70ae196a523c06ceda71370fd3ea78359

    SHA512

    494fe5f0ade03669e5830bed93c964d69b86629440148d7b0881cf53203fd89443ebff9b4d1ee9d96244f62af6edede622d9eacba37f80f389a0d522e4ad4ea4

  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\ModuleAnalysisCache
    Filesize

    53KB

    MD5

    06ad34f9739c5159b4d92d702545bd49

    SHA1

    9152a0d4f153f3f40f7e606be75f81b582ee0c17

    SHA256

    474813b625f00710f29fa3b488235a6a22201851efb336bddf60d7d24a66bfba

    SHA512

    c272cd28ae164d465b779163ba9eca6a28261376414c6bbdfbd9f2128adb7f7ff1420e536b4d6000d0301ded2ec9036bc5c657588458bff41f176bdce8d74f92

  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
    Filesize

    16KB

    MD5

    a8e98e1f71466fcc8c79a7e78870520c

    SHA1

    c40ee49085b4943cf29d8d38f00fd93b60da2b8a

    SHA256

    415bdc85421a592df15f1990239a79674a5b9d0ff56fa2ab3924ecdf7ee06a67

    SHA512

    86810991485502d088505b3248df4986ef1780437e4ba39c63ed0b6b8ffbf9b0632a2481ebea882874efd6e39cf4b9b9a5a04acdcc9b8e58f5340fbfac0be1c7

  • C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\setup_ov2.exe
    Filesize

    362.4MB

    MD5

    6c14c4def456320e26c2ea5f2886e3a4

    SHA1

    530f9425a6b3d8e78a035e11efb4be27d2bcacf4

    SHA256

    8ff1b246e839bb692cb41ae3c09b7048a361eef6ebd6b2316b4d3ea8e3b78afa

    SHA512

    63ef77b2f31e596916e574ae0c77a0dcc62f09753753e7299f4abc070dc32f7be07115c8da11868f165cb181e8681351524875e049ba5be2a1ab2c68e83ac5ae

  • C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\setup_ov2.exe
    Filesize

    362.4MB

    MD5

    6c14c4def456320e26c2ea5f2886e3a4

    SHA1

    530f9425a6b3d8e78a035e11efb4be27d2bcacf4

    SHA256

    8ff1b246e839bb692cb41ae3c09b7048a361eef6ebd6b2316b4d3ea8e3b78afa

    SHA512

    63ef77b2f31e596916e574ae0c77a0dcc62f09753753e7299f4abc070dc32f7be07115c8da11868f165cb181e8681351524875e049ba5be2a1ab2c68e83ac5ae

  • C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\setup_ov2.exe
    Filesize

    362.4MB

    MD5

    6c14c4def456320e26c2ea5f2886e3a4

    SHA1

    530f9425a6b3d8e78a035e11efb4be27d2bcacf4

    SHA256

    8ff1b246e839bb692cb41ae3c09b7048a361eef6ebd6b2316b4d3ea8e3b78afa

    SHA512

    63ef77b2f31e596916e574ae0c77a0dcc62f09753753e7299f4abc070dc32f7be07115c8da11868f165cb181e8681351524875e049ba5be2a1ab2c68e83ac5ae

  • C:\Users\Admin\AppData\Local\Temp\Tperiuiu.tmp
    Filesize

    3.5MB

    MD5

    552c24c5983c8624f49cedd2695b43d7

    SHA1

    f86503b92829adf9c262172690000f06171ee253

    SHA256

    30d0e2421c18b22ff2d9128f0607043650a33f3ad7ac8d9a52578b914d4ad1f3

    SHA512

    986528217392730a66440fbef5a90dad4f2982445b7a2a8f15a8d73cc607633af0ec1b665101d2eddb3764fc9e53e625008d6bf1ec89d7bf54b9aa9de583ec62

  • memory/1332-184-0x0000000003700000-0x0000000003840000-memory.dmp
    Filesize

    1.2MB

  • memory/1332-183-0x0000000000B50000-0x0000000001589000-memory.dmp
    Filesize

    10.2MB

  • memory/1332-182-0x0000000002BA0000-0x00000000036F9000-memory.dmp
    Filesize

    11.3MB

  • memory/1332-186-0x0000000002BA0000-0x00000000036F9000-memory.dmp
    Filesize

    11.3MB

  • memory/1332-181-0x0000000000000000-mapping.dmp
  • memory/1332-185-0x0000000003700000-0x0000000003840000-memory.dmp
    Filesize

    1.2MB

  • memory/1808-167-0x0000000007600000-0x000000000761A000-memory.dmp
    Filesize

    104KB

  • memory/1808-146-0x0000000000000000-mapping.dmp
  • memory/1808-163-0x0000000007660000-0x00000000076F6000-memory.dmp
    Filesize

    600KB

  • memory/1808-162-0x0000000007470000-0x000000000747A000-memory.dmp
    Filesize

    40KB

  • memory/1808-166-0x0000000005F00000-0x0000000005F0E000-memory.dmp
    Filesize

    56KB

  • memory/1808-161-0x0000000006660000-0x000000000667E000-memory.dmp
    Filesize

    120KB

  • memory/1808-159-0x0000000070F20000-0x0000000070F6C000-memory.dmp
    Filesize

    304KB

  • memory/1808-158-0x0000000006680000-0x00000000066B2000-memory.dmp
    Filesize

    200KB

  • memory/1808-168-0x0000000007460000-0x0000000007468000-memory.dmp
    Filesize

    32KB

  • memory/3124-145-0x0000000000000000-mapping.dmp
  • memory/3240-160-0x0000000000000000-mapping.dmp
  • memory/4672-144-0x0000000006080000-0x000000000609A000-memory.dmp
    Filesize

    104KB

  • memory/4672-137-0x0000000000000000-mapping.dmp
  • memory/4672-138-0x0000000002520000-0x0000000002556000-memory.dmp
    Filesize

    216KB

  • memory/4672-139-0x0000000004D50000-0x0000000005378000-memory.dmp
    Filesize

    6.2MB

  • memory/4672-140-0x0000000004C70000-0x0000000004CD6000-memory.dmp
    Filesize

    408KB

  • memory/4672-141-0x00000000054F0000-0x0000000005556000-memory.dmp
    Filesize

    408KB

  • memory/4672-142-0x0000000005B90000-0x0000000005BAE000-memory.dmp
    Filesize

    120KB

  • memory/4672-143-0x00000000071F0000-0x000000000786A000-memory.dmp
    Filesize

    6.5MB

  • memory/4876-179-0x0000000004210000-0x0000000004350000-memory.dmp
    Filesize

    1.2MB

  • memory/4876-175-0x0000000004210000-0x0000000004350000-memory.dmp
    Filesize

    1.2MB

  • memory/4876-165-0x000000000068B000-0x0000000000691000-memory.dmp
    Filesize

    24KB

  • memory/4876-155-0x0000000000400000-0x00000000006DB000-memory.dmp
    Filesize

    2.9MB

  • memory/4876-149-0x0000000000400000-0x00000000006DB000-memory.dmp
    Filesize

    2.9MB

  • memory/4876-151-0x0000000000400000-0x00000000006DB000-memory.dmp
    Filesize

    2.9MB

  • memory/4876-170-0x00000000033B0000-0x0000000003F09000-memory.dmp
    Filesize

    11.3MB

  • memory/4876-171-0x00000000033B0000-0x0000000003F09000-memory.dmp
    Filesize

    11.3MB

  • memory/4876-172-0x00000000033B0000-0x0000000003F09000-memory.dmp
    Filesize

    11.3MB

  • memory/4876-173-0x0000000004210000-0x0000000004350000-memory.dmp
    Filesize

    1.2MB

  • memory/4876-174-0x0000000004210000-0x0000000004350000-memory.dmp
    Filesize

    1.2MB

  • memory/4876-164-0x0000000000400000-0x00000000006DB000-memory.dmp
    Filesize

    2.9MB

  • memory/4876-176-0x0000000004210000-0x0000000004350000-memory.dmp
    Filesize

    1.2MB

  • memory/4876-177-0x0000000004210000-0x0000000004350000-memory.dmp
    Filesize

    1.2MB

  • memory/4876-178-0x0000000004210000-0x0000000004350000-memory.dmp
    Filesize

    1.2MB

  • memory/4876-156-0x000000000068B000-0x0000000000691000-memory.dmp
    Filesize

    24KB

  • memory/4876-180-0x0000000004210000-0x0000000004350000-memory.dmp
    Filesize

    1.2MB

  • memory/4876-148-0x0000000000000000-mapping.dmp
  • memory/4876-152-0x0000000000400000-0x00000000006DB000-memory.dmp
    Filesize

    2.9MB

  • memory/4876-153-0x0000000000400000-0x00000000006DB000-memory.dmp
    Filesize

    2.9MB

  • memory/5064-132-0x0000000000000000-mapping.dmp
  • memory/5064-136-0x0000000008140000-0x0000000008162000-memory.dmp
    Filesize

    136KB

  • memory/5064-135-0x0000000000E20000-0x0000000000E2C000-memory.dmp
    Filesize

    48KB