Analysis

  • max time kernel
    150s
  • max time network
    147s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    28/03/2025, 08:19

General

  • Target

    78b8cd9ed9cdfe32f62396f1546c0739b66cf15c8ef5a71d5858358295fc8b15.dll

  • Size

    2.2MB

  • MD5

    cc66527f0069ca11c2f1f51411135199

  • SHA1

    4e3d3f90abc13e451822f20a943a158d5ed1d207

  • SHA256

    78b8cd9ed9cdfe32f62396f1546c0739b66cf15c8ef5a71d5858358295fc8b15

  • SHA512

    71e028b43aca70c2c06fa16226d71602121b3bb78806c098386ebd6d4e255875f498c0861f908ee723139ea8b448f73cc6de1afb3b0c8dff7e3ac77273029133

  • SSDEEP

    49152:L2cV7CFHgGbWJsUqtmNaOhVYcSUuamW5zo76e7+7WVuSwiPSCmDS+5uSlZLun40:NxOAGbWuUmmNaMVrSU735zoWe7+7WGu

Malware Config

Extracted

Family

valleyrat_s2

Version

1.0

C2

154.44.8.39:443

154.44.8.39:80

154.44.8.39:8011

Attributes
  • campaign_date

    2025. 3. 7

Signatures

  • ValleyRat

    ValleyRat stage2 is a backdoor written in C++.

  • Valleyrat_s2 family
  • Blocklisted process makes network request 3 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

    Using powershell.exe command.

  • Enumerates connected drives 3 TTPs 22 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Enumerates processes with tasklist 1 TTPs 6 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 24 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Delays execution with timeout.exe 6 IoCs
  • Suspicious behavior: EnumeratesProcesses 52 IoCs
  • Suspicious use of AdjustPrivilegeToken 8 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Windows\system32\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Local\Temp\78b8cd9ed9cdfe32f62396f1546c0739b66cf15c8ef5a71d5858358295fc8b15.dll,#1
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2412
    • C:\Windows\SysWOW64\rundll32.exe
      rundll32.exe C:\Users\Admin\AppData\Local\Temp\78b8cd9ed9cdfe32f62396f1546c0739b66cf15c8ef5a71d5858358295fc8b15.dll,#1
      2⤵
      • Blocklisted process makes network request
      • Enumerates connected drives
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1704
      • C:\Windows\SysWOW64\cmd.exe
        cmd.exe /B /c "C:\Users\Admin\AppData\Local\Temp\\monitor.bat"
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:1724
        • C:\Windows\SysWOW64\tasklist.exe
          tasklist /FI "IMAGENAME eq rundll32.exe"
          4⤵
          • Enumerates processes with tasklist
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          PID:2540
        • C:\Windows\SysWOW64\findstr.exe
          findstr /I "rundll32.exe"
          4⤵
          • System Location Discovery: System Language Discovery
          PID:2420
        • C:\Windows\SysWOW64\timeout.exe
          timeout /t 30 /nobreak
          4⤵
          • System Location Discovery: System Language Discovery
          • Delays execution with timeout.exe
          PID:2916
        • C:\Windows\SysWOW64\tasklist.exe
          tasklist /FI "IMAGENAME eq rundll32.exe"
          4⤵
          • Enumerates processes with tasklist
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          PID:2968
        • C:\Windows\SysWOW64\findstr.exe
          findstr /I "rundll32.exe"
          4⤵
          • System Location Discovery: System Language Discovery
          PID:2960
        • C:\Windows\SysWOW64\timeout.exe
          timeout /t 30 /nobreak
          4⤵
          • System Location Discovery: System Language Discovery
          • Delays execution with timeout.exe
          PID:1504
        • C:\Windows\SysWOW64\tasklist.exe
          tasklist /FI "IMAGENAME eq rundll32.exe"
          4⤵
          • Enumerates processes with tasklist
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          PID:2864
        • C:\Windows\SysWOW64\findstr.exe
          findstr /I "rundll32.exe"
          4⤵
          • System Location Discovery: System Language Discovery
          PID:1652
        • C:\Windows\SysWOW64\timeout.exe
          timeout /t 30 /nobreak
          4⤵
          • System Location Discovery: System Language Discovery
          • Delays execution with timeout.exe
          PID:320
        • C:\Windows\SysWOW64\tasklist.exe
          tasklist /FI "IMAGENAME eq rundll32.exe"
          4⤵
          • Enumerates processes with tasklist
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          PID:2000
        • C:\Windows\SysWOW64\findstr.exe
          findstr /I "rundll32.exe"
          4⤵
          • System Location Discovery: System Language Discovery
          PID:1188
        • C:\Windows\SysWOW64\timeout.exe
          timeout /t 30 /nobreak
          4⤵
          • System Location Discovery: System Language Discovery
          • Delays execution with timeout.exe
          PID:1780
        • C:\Windows\SysWOW64\tasklist.exe
          tasklist /FI "IMAGENAME eq rundll32.exe"
          4⤵
          • Enumerates processes with tasklist
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          PID:2980
        • C:\Windows\SysWOW64\findstr.exe
          findstr /I "rundll32.exe"
          4⤵
          • System Location Discovery: System Language Discovery
          PID:2708
        • C:\Windows\SysWOW64\timeout.exe
          timeout /t 30 /nobreak
          4⤵
          • System Location Discovery: System Language Discovery
          • Delays execution with timeout.exe
          PID:2168
        • C:\Windows\SysWOW64\tasklist.exe
          tasklist /FI "IMAGENAME eq rundll32.exe"
          4⤵
          • Enumerates processes with tasklist
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          PID:2384
        • C:\Windows\SysWOW64\findstr.exe
          findstr /I "rundll32.exe"
          4⤵
          • System Location Discovery: System Language Discovery
          PID:2148
        • C:\Windows\SysWOW64\timeout.exe
          timeout /t 30 /nobreak
          4⤵
          • System Location Discovery: System Language Discovery
          • Delays execution with timeout.exe
          PID:1868
      • C:\Windows\SysWOW64\cmd.exe
        cmd.exe /C powershell -Command "Set-ExecutionPolicy Unrestricted -Scope CurrentUser"
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2988
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          powershell -Command "Set-ExecutionPolicy Unrestricted -Scope CurrentUser"
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2616
      • C:\Windows\SysWOW64\cmd.exe
        cmd.exe /C powershell -ExecutionPolicy Bypass -File C:\Users\Admin\AppData\Local\updated.ps1
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2344
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          powershell -ExecutionPolicy Bypass -File C:\Users\Admin\AppData\Local\updated.ps1
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2624

Network

MITRE ATT&CK Enterprise v15

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\monitor.bat

    Filesize

    721B

    MD5

    a8795b0c718e389335caa55d74cbdb69

    SHA1

    d511c944c9552769c23254a6e4c503fd1aa43cfe

    SHA256

    97ab5b43ce973c01dde10b088372de3612b5bd65adc8b6a402e709e2e7c6b29b

    SHA512

    f69967863c6d7e49bf55c96ce7d24199ca2b0d4d5cbd1be9b8616e9025bdd1573f47d6bb4e5925a20e3e3647a0178a5097e391448dec0f0fa9690272a4d09cc3

  • C:\Users\Admin\AppData\Local\updated.ps1

    Filesize

    151B

    MD5

    aa0e1012d3b7c24fad1be4806756c2cf

    SHA1

    fe0d130af9105d9044ff3d657d1abeaf0b750516

    SHA256

    fc47e1fa89397c3139d9047dc667531a9153a339f8e29ac713e518d51a995897

    SHA512

    15fae192951747a0c71059f608700f88548f3e60bb5c708b206bf793a7e3d059a278f2058d4ac86b86781b202037401a29602ee4d6c0cbaaff532cef311975f4

  • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms

    Filesize

    7KB

    MD5

    5f1a6b6ccc5a39e315868ac05f44167c

    SHA1

    1cb1370026f0205dcec3021e37b75301e323f898

    SHA256

    ded0418281e940254b3f0561bb9a1b529c14d962de747013492d7bfafdebc4e1

    SHA512

    2fc433ae7d907c0997c73835f9a5126d63bbd9a684cc35bd1c3ed366cf01e84aff01cfa611fcfa5ae58dfb6da9ccd4cfa46ac1b8c8948f246b96a0be6df37322

  • memory/1704-18-0x0000000002750000-0x0000000002788000-memory.dmp

    Filesize

    224KB

  • memory/1704-20-0x0000000002750000-0x0000000002788000-memory.dmp

    Filesize

    224KB

  • memory/1704-12-0x0000000010000000-0x0000000010024000-memory.dmp

    Filesize

    144KB

  • memory/1704-15-0x00000000026D0000-0x0000000002702000-memory.dmp

    Filesize

    200KB

  • memory/1704-14-0x0000000010000000-0x0000000010024000-memory.dmp

    Filesize

    144KB

  • memory/1704-17-0x0000000002750000-0x0000000002788000-memory.dmp

    Filesize

    224KB

  • memory/1704-16-0x0000000002750000-0x0000000002788000-memory.dmp

    Filesize

    224KB

  • memory/1704-4-0x0000000010000000-0x0000000010024000-memory.dmp

    Filesize

    144KB

  • memory/1704-19-0x0000000002750000-0x0000000002788000-memory.dmp

    Filesize

    224KB

  • memory/1704-13-0x0000000010000000-0x0000000010024000-memory.dmp

    Filesize

    144KB

  • memory/1704-21-0x0000000010000000-0x0000000010024000-memory.dmp

    Filesize

    144KB

  • memory/1704-22-0x0000000010000000-0x0000000010024000-memory.dmp

    Filesize

    144KB

  • memory/1704-23-0x0000000002750000-0x0000000002788000-memory.dmp

    Filesize

    224KB

  • memory/1704-24-0x00000000022F0000-0x000000000231F000-memory.dmp

    Filesize

    188KB

  • memory/1704-30-0x0000000002750000-0x0000000002788000-memory.dmp

    Filesize

    224KB

  • memory/1704-29-0x0000000002750000-0x0000000002788000-memory.dmp

    Filesize

    224KB

  • memory/1704-11-0x0000000010000000-0x0000000010024000-memory.dmp

    Filesize

    144KB

  • memory/1704-10-0x0000000000190000-0x00000000001AD000-memory.dmp

    Filesize

    116KB

  • memory/1704-42-0x0000000002750000-0x0000000002788000-memory.dmp

    Filesize

    224KB