Resubmissions

01-11-2021 12:31

211101-pp5r3ahha4 10

31-10-2021 09:03

211031-k1bwxacfaq 10

14-10-2021 01:44

211014-b6aflafeg4 10

Analysis

  • max time kernel
    208s
  • max time network
    372s
  • platform
    windows11_x64
  • resource
    win11
  • submitted
    01-11-2021 12:31

General

  • Target

    2a0a88a2e5f9cafa10a48d63bdfcdf965b72c25978ab46cf28e795dbedc9624a.dll

  • Size

    506KB

  • MD5

    803768a34f7e59b8a9a2f3969624c47e

  • SHA1

    09a38940ef023929897fdc9c996de0b0f39116e2

  • SHA256

    2a0a88a2e5f9cafa10a48d63bdfcdf965b72c25978ab46cf28e795dbedc9624a

  • SHA512

    21e4aa621360a4ec4a0c73fad494e133f2584f92d058a72772e390c7bf1e1ad3e4d0778e95b590c663fe5efed3cfbecb08d5e78e1216c1bfbef729062806722f

Malware Config

Extracted

Family

squirrelwaffle

C2

http://acdlimited.com/2u6aW9Pfe

http://jornaldasoficinas.com/ZF8GKIGVDupL

http://orldofjain.com/lMsTA7tSYpe

http://altayaralsudani.net/SSUsPgb7PHgC

http://hoteloaktree.com/QthLWsZsVgb

http://aterwellnessinc.com/U7D0sswwp

http://sirifinco.com/Urbhq9wO50j

http://ordpress17.com/5WG6Z62sKWo

http://mohsinkhanfoundation.com/pcQLeLMbur

http://lendbiz.vn/xj3BhHtMbf

http://geosever.rs/ObHP1CHt

http://nuevainfotech.com/xCNyTjzkoe

http://dadabhoy.pk/m6rQE94U

http://111

http://sjgrand.lk/zvMYuQqEZj

http://erogholding.com/GFM1QcCFk

http://armordetailing.rs/lgfrZb4Re6WO

http://lefrenchwineclub.com/eRUGdDox

Signatures

  • SquirrelWaffle is a simple downloader written in C++.

    SquirrelWaffle.

  • Suspicious use of NtCreateProcessExOtherParentProcess 1 IoCs
  • Squirrelwaffle Payload 2 IoCs
  • Sets service image path in registry 2 TTPs
  • Drops file in Windows directory 8 IoCs
  • Program crash 1 IoCs
  • Checks processor information in registry 2 TTPs 9 IoCs

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

  • Enumerates system info in registry 2 TTPs 2 IoCs
  • Modifies data under HKEY_USERS 64 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 7 IoCs

Processes

  • C:\Windows\system32\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Local\Temp\2a0a88a2e5f9cafa10a48d63bdfcdf965b72c25978ab46cf28e795dbedc9624a.dll,#1
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3124
    • C:\Windows\SysWOW64\rundll32.exe
      rundll32.exe C:\Users\Admin\AppData\Local\Temp\2a0a88a2e5f9cafa10a48d63bdfcdf965b72c25978ab46cf28e795dbedc9624a.dll,#1
      2⤵
        PID:5016
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5016 -s 552
          3⤵
          • Program crash
          • Checks processor information in registry
          • Enumerates system info in registry
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2496
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 368 -p 5016 -ip 5016
      1⤵
      • Suspicious use of NtCreateProcessExOtherParentProcess
      • Suspicious use of WriteProcessMemory
      PID:2112
    • C:\Windows\System32\WaaSMedicAgent.exe
      C:\Windows\System32\WaaSMedicAgent.exe 74f335d5d6d12378bdb559a9f9c27547 YkIerkvckk62wLJhalYv+Q.0.1.0.3.0
      1⤵
      • Modifies data under HKEY_USERS
      PID:2340
    • C:\Windows\system32\svchost.exe
      C:\Windows\system32\svchost.exe -k netsvcs -p -s wuauserv
      1⤵
      • Drops file in Windows directory
      • Modifies data under HKEY_USERS
      • Suspicious use of AdjustPrivilegeToken
      PID:5012
    • C:\Windows\system32\svchost.exe
      C:\Windows\system32\svchost.exe -k netsvcs -p -s UsoSvc
      1⤵
      • Checks processor information in registry
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1552
      • C:\Windows\uus\AMD64\MoUsoCoreWorker.exe
        C:\Windows\uus\AMD64\MoUsoCoreWorker.exe
        2⤵
          PID:2964
      • C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.22000.100_none_04da31ff4c67c24a\TiWorker.exe
        C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.22000.100_none_04da31ff4c67c24a\TiWorker.exe -Embedding
        1⤵
        • Drops file in Windows directory
        • Suspicious use of AdjustPrivilegeToken
        PID:2672
      • C:\Windows\System32\WaaSMedicAgent.exe
        C:\Windows\System32\WaaSMedicAgent.exe 74f335d5d6d12378bdb559a9f9c27547 YkIerkvckk62wLJhalYv+Q.0.1.0.3.0
        1⤵
        • Modifies data under HKEY_USERS
        PID:1500
      • C:\Windows\System32\WaaSMedicAgent.exe
        C:\Windows\System32\WaaSMedicAgent.exe 74f335d5d6d12378bdb559a9f9c27547 YkIerkvckk62wLJhalYv+Q.0.1.0.3.0
        1⤵
        • Modifies data under HKEY_USERS
        PID:2060

      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

      2
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • memory/2964-154-0x0000000000000000-mapping.dmp
      • memory/5012-151-0x000001D23FB20000-0x000001D23FB30000-memory.dmp
        Filesize

        64KB

      • memory/5012-152-0x000001D23FBA0000-0x000001D23FBB0000-memory.dmp
        Filesize

        64KB

      • memory/5012-153-0x000001D2422B0000-0x000001D2422B4000-memory.dmp
        Filesize

        16KB

      • memory/5016-146-0x0000000000000000-mapping.dmp
      • memory/5016-147-0x0000000004280000-0x00000000042FE000-memory.dmp
        Filesize

        504KB

      • memory/5016-148-0x0000000002C50000-0x0000000002C51000-memory.dmp
        Filesize

        4KB

      • memory/5016-149-0x00000000045B0000-0x00000000045C1000-memory.dmp
        Filesize

        68KB

      • memory/5016-150-0x0000000004930000-0x0000000004940000-memory.dmp
        Filesize

        64KB