Analysis

  • max time kernel
    147s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13/04/2023, 12:41

General

  • Target
    PURCHASEORDER002772-PDF.js
  • Size 1.3MB
  • Sample230413-pwrtsabd65
  • SHA256 ee060ddb962a0dd766cebce60df2f8e32eaa7e5f5d73a802834e39f3713b657d
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • STRRAT

    STRRAT is a remote access tool than can steal credentials and log keystrokes.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Drops startup file 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Looks up external IP address via web service 1 IoCs

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

  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Modifies registry class 1 IoCs
  • Runs .reg file with regedit 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Windows\system32\wscript.exe
    wscript.exe C:\Users\Admin\AppData\Local\Temp\PURCHASEORDER002772-PDF.js
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:4108
    • C:\Windows\regedit.exe
      "regedit.exe" "C:\Users\Admin\AppData\Local\Temp\ebgeaegdbdecaedfebace.reg"
      2⤵
      • Runs .reg file with regedit
      PID:4908
    • C:\Program Files\Java\jre1.8.0_66\bin\javaw.exe
      "C:\Program Files\Java\jre1.8.0_66\bin\javaw.exe" -jar "C:\Users\Admin\AppData\Roaming\knlkcbpo.txt"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3916
      • C:\Program Files\Java\jre1.8.0_66\bin\java.exe
        "C:\Program Files\Java\jre1.8.0_66\bin\java.exe" -jar "C:\Users\Admin\knlkcbpo.txt"
        3⤵
        • Drops startup file
        • Adds Run key to start application
        • Suspicious use of WriteProcessMemory
        PID:4056
        • C:\Windows\SYSTEM32\cmd.exe
          cmd /c schtasks /create /sc minute /mo 30 /tn Skype /tr "C:\Users\Admin\AppData\Roaming\knlkcbpo.txt"
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:1220
          • C:\Windows\system32\schtasks.exe
            schtasks /create /sc minute /mo 30 /tn Skype /tr "C:\Users\Admin\AppData\Roaming\knlkcbpo.txt"
            5⤵
            • Creates scheduled task(s)
            PID:2676
        • C:\Program Files\Java\jre1.8.0_66\bin\java.exe
          "C:\Program Files\Java\jre1.8.0_66\bin\java.exe" -jar "C:\Users\Admin\AppData\Roaming\knlkcbpo.txt"
          4⤵
          • Loads dropped DLL
          • Suspicious use of WriteProcessMemory
          PID:732
          • C:\Windows\SYSTEM32\cmd.exe
            cmd.exe /c "wmic /node:. /namespace:'\\root\cimv2' path win32_logicaldisk get volumeserialnumber /format:list"
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:2600
            • C:\Windows\System32\Wbem\WMIC.exe
              wmic /node:. /namespace:'\\root\cimv2' path win32_logicaldisk get volumeserialnumber /format:list
              6⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:1512
          • C:\Windows\SYSTEM32\cmd.exe
            cmd.exe /c "wmic /node:. /namespace:'\\root\cimv2' path win32_operatingsystem get caption,OSArchitecture /format:list"
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:1108
            • C:\Windows\System32\Wbem\WMIC.exe
              wmic /node:. /namespace:'\\root\cimv2' path win32_operatingsystem get caption,OSArchitecture /format:list
              6⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:1368
          • C:\Windows\SYSTEM32\cmd.exe
            cmd.exe /c "wmic /node:. /namespace:'\\root\cimv2' path win32_operatingsystem get version /format:list"
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:3964
            • C:\Windows\System32\Wbem\WMIC.exe
              wmic /node:. /namespace:'\\root\cimv2' path win32_operatingsystem get version /format:list
              6⤵
                PID:4688
            • C:\Windows\SYSTEM32\cmd.exe
              cmd.exe /c "wmic /node:localhost /namespace:'\\root\securitycenter2' path antivirusproduct get displayname /format:list"
              5⤵
              • Suspicious use of WriteProcessMemory
              PID:1356
              • C:\Windows\System32\Wbem\WMIC.exe
                wmic /node:localhost /namespace:'\\root\securitycenter2' path antivirusproduct get displayname /format:list
                6⤵
                  PID:4140

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            90737d32e3aba4b.timestamp

            • Path C:\Users\Admin\.oracle_jre_usage\90737d32e3aba4b.timestamp
            • Size 50B
            • SHA256 bc1e07473a316e4fceef116b2aa484cfcb5068e315bace029597f86a75ae2708
            • MD5 SHA1 SHA512

            90737d32e3aba4b.timestamp

            • Path C:\Users\Admin\.oracle_jre_usage\90737d32e3aba4b.timestamp
            • Size 50B
            • SHA256 8336db721bab22f10bdef4c64ea1c4266e2be812acf0de73e346720eafe53137
            • MD5 SHA1 SHA512

            ebgeaegdbdecaedfebace.reg

            • Path C:\Users\Admin\AppData\Local\Temp\ebgeaegdbdecaedfebace.reg
            • Size 143B
            • SHA256 cb68d50df5817e51ec5b2f72893dc4c749bf3504519107e0a78dda84d55f09e2
            • MD5 SHA1 SHA512

            jna7090178329450252471.dll

            • Path C:\Users\Admin\AppData\Local\Temp\jna-63116079\jna7090178329450252471.dll
            • Size 241KB
            • SHA256 a66959bec2ef5af730198db9f3b3f7cab0d4ae70ce01bec02bf1d738e6d1ee7a
            • MD5 SHA1 SHA512 SSDEEP

            83aa4cc77f591dfc2374580bbd95f6ba_8d6935fa-0795-4a6f-bfd9-e755f1917fa0

            • Path C:\Users\Admin\AppData\Roaming\Microsoft\Crypto\RSA\S-1-5-21-1675742406-747946869-1029867430-1000\83aa4cc77f591dfc2374580bbd95f6ba_8d6935fa-0795-4a6f-bfd9-e755f1917fa0
            • Size 45B
            • SHA256 11e6aca8e682c046c83b721eeb5c72c5ef03cb5936c60df6f4993511ddc61238
            • MD5 SHA1 SHA512

            knlkcbpo.txt

            • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\knlkcbpo.txt
            • Size 164KB
            • SHA256 108d0a17e97da49b8a9d1a8d8c1e8084443a5ac81c15523f0d0cec287299df15
            • MD5 SHA1 SHA512 SSDEEP

            knlkcbpo.txt

            • Path C:\Users\Admin\AppData\Roaming\knlkcbpo.txt
            • Size 164KB
            • SHA256 108d0a17e97da49b8a9d1a8d8c1e8084443a5ac81c15523f0d0cec287299df15
            • MD5 SHA1 SHA512 SSDEEP

            knlkcbpo.txt

            • Path C:\Users\Admin\AppData\Roaming\knlkcbpo.txt
            • Size 164KB
            • SHA256 108d0a17e97da49b8a9d1a8d8c1e8084443a5ac81c15523f0d0cec287299df15
            • MD5 SHA1 SHA512 SSDEEP

            jna-5.5.0.jar

            • Path C:\Users\Admin\AppData\Roaming\lib\jna-5.5.0.jar
            • Size 1.4MB
            • SHA256 b308faebfe4ed409de8410e0a632d164b2126b035f6eacff968d3908cafb4d9e
            • MD5 SHA1 SHA512 SSDEEP

            jna-platform-5.5.0.jar

            • Path C:\Users\Admin\AppData\Roaming\lib\jna-platform-5.5.0.jar
            • Size 2.6MB
            • SHA256 24d81621f82ac29fcdd9a74116031f5907a2343158e616f4573bbfa2434ae0d5
            • MD5 SHA1 SHA512 SSDEEP

            sqlite-jdbc-3.14.2.1.jar

            • Path C:\Users\Admin\AppData\Roaming\lib\sqlite-jdbc-3.14.2.1.jar
            • Size 4.1MB
            • SHA256 2eae3dea1c3dde6104c49f9601074b6038ff6abcf3be23f4b56f6720a4f6a491
            • MD5 SHA1 SHA512 SSDEEP

            system-hook-3.5.jar

            • Path C:\Users\Admin\AppData\Roaming\lib\system-hook-3.5.jar
            • Size 772KB
            • SHA256 2ddda8af6faef8bde46acf43ec546603180bcf8dcb2e5591fff8ac9cd30b5609
            • MD5 SHA1 SHA512 SSDEEP

            knlkcbpo.txt

            • Path C:\Users\Admin\knlkcbpo.txt
            • Size 164KB
            • SHA256 108d0a17e97da49b8a9d1a8d8c1e8084443a5ac81c15523f0d0cec287299df15
            • MD5 SHA1 SHA512 SSDEEP

            jna-5.5.0.jar

            • Path C:\Users\Admin\lib\jna-5.5.0.jar
            • Size 1.4MB
            • SHA256 b308faebfe4ed409de8410e0a632d164b2126b035f6eacff968d3908cafb4d9e
            • MD5 SHA1 SHA512 SSDEEP

            jna-platform-5.5.0.jar

            • Path C:\Users\Admin\lib\jna-platform-5.5.0.jar
            • Size 2.6MB
            • SHA256 24d81621f82ac29fcdd9a74116031f5907a2343158e616f4573bbfa2434ae0d5
            • MD5 SHA1 SHA512 SSDEEP

            sqlite-jdbc-3.14.2.1.jar

            • Path C:\Users\Admin\lib\sqlite-jdbc-3.14.2.1.jar
            • Size 4.1MB
            • SHA256 2eae3dea1c3dde6104c49f9601074b6038ff6abcf3be23f4b56f6720a4f6a491
            • MD5 SHA1 SHA512 SSDEEP

            system-hook-3.5.jar

            • Path C:\Users\Admin\lib\system-hook-3.5.jar
            • Size 772KB
            • SHA256 2ddda8af6faef8bde46acf43ec546603180bcf8dcb2e5591fff8ac9cd30b5609
            • MD5 SHA1 SHA512 SSDEEP

            memory/732-276-0x0000000000C70000-0x0000000000C71000-memory.dmp

            memory/732-262-0x0000000000C70000-0x0000000000C71000-memory.dmp

            memory/732-256-0x0000000000C70000-0x0000000000C71000-memory.dmp

            memory/3916-195-0x0000000002970000-0x0000000002971000-memory.dmp

            memory/3916-183-0x0000000002970000-0x0000000002971000-memory.dmp

            memory/3916-209-0x0000000002970000-0x0000000002971000-memory.dmp

            memory/3916-207-0x0000000002970000-0x0000000002971000-memory.dmp

            memory/3916-193-0x0000000002970000-0x0000000002971000-memory.dmp

            memory/3916-192-0x0000000002970000-0x0000000002971000-memory.dmp

            memory/3916-191-0x0000000002970000-0x0000000002971000-memory.dmp

            memory/3916-203-0x0000000002970000-0x0000000002971000-memory.dmp

            memory/3916-182-0x0000000002970000-0x0000000002971000-memory.dmp

            memory/3916-178-0x0000000002970000-0x0000000002971000-memory.dmp

            memory/3916-204-0x0000000002970000-0x0000000002971000-memory.dmp

            memory/3916-166-0x0000000002970000-0x0000000002971000-memory.dmp

            memory/3916-211-0x0000000002970000-0x0000000002971000-memory.dmp

            memory/3916-149-0x0000000002970000-0x0000000002971000-memory.dmp

            memory/4056-228-0x0000000001150000-0x0000000001151000-memory.dmp