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Analysis

  • max time kernel
    91s
  • max time network
    126s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20/01/2023, 19:01

General

  • Target

    757F9B45EE33980B07406AEF416BF25C.exe

  • Size

    465KB

  • MD5

    757f9b45ee33980b07406aef416bf25c

  • SHA1

    f950bd2804f25122dbd49e1c515567e5d151a134

  • SHA256

    f4d42993edb8d76c99b92ae963656adde31f57336032bd351163ae2322475eca

  • SHA512

    1a48d5d530660a1cf1b744e670861e7c7ce69d251f8ba2d48ad16617c6ff8bb144b8015e36028b9f57e9101b8fa4098005c151856be92948ed5c360f59458522

  • SSDEEP

    12288:yA/U/fxrZijLXWgPkzzzzzXy9nzzzzK4J9wzpCHzcHtR/uzn:yAcxmPkzzzzzXy9nzzzzK4J98pCHzuRe

Malware Config

Extracted

Family

oski

C2

anstransport.com

Signatures

  • Oski

    Oski is an infostealer targeting browser data, crypto wallets.

  • Downloads MZ/PE file
  • Executes dropped EXE 4 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Loads dropped DLL 3 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • 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 1 IoCs

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

  • Kills process with taskkill 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 29 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\757F9B45EE33980B07406AEF416BF25C.exe
    "C:\Users\Admin\AppData\Local\Temp\757F9B45EE33980B07406AEF416BF25C.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4960
    • C:\Users\Admin\AppData\Roaming\Bitcoin Wallet.exe
      "C:\Users\Admin\AppData\Roaming\Bitcoin Wallet.exe"
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious use of SetThreadContext
      • Suspicious use of WriteProcessMemory
      PID:2464
      • C:\Users\Admin\AppData\Roaming\Bitcoin Wallet.exe
        "C:\Users\Admin\AppData\Roaming\Bitcoin Wallet.exe"
        3⤵
        • Executes dropped EXE
        • Checks computer location settings
        • Loads dropped DLL
        • Checks processor information in registry
        • Suspicious use of WriteProcessMemory
        PID:3076
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c taskkill /pid 3076 & erase C:\Users\Admin\AppData\Roaming\Bitcoin Wallet.exe & RD /S /Q C:\\ProgramData\\758379951324060\\* & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:4528
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /pid 3076
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:3428
    • C:\Users\Admin\AppData\Roaming\svc host.exe
      "C:\Users\Admin\AppData\Roaming\svc host.exe"
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious use of SetThreadContext
      • Suspicious use of WriteProcessMemory
      PID:2460
      • C:\Users\Admin\AppData\Roaming\svc host.exe
        "C:\Users\Admin\AppData\Roaming\svc host.exe"
        3⤵
        • Executes dropped EXE
        PID:1500

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\ProgramData\mozglue.dll

    Filesize

    133KB

    MD5

    8f73c08a9660691143661bf7332c3c27

    SHA1

    37fa65dd737c50fda710fdbde89e51374d0c204a

    SHA256

    3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

    SHA512

    0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

  • C:\ProgramData\nss3.dll

    Filesize

    1.2MB

    MD5

    bfac4e3c5908856ba17d41edcd455a51

    SHA1

    8eec7e888767aa9e4cca8ff246eb2aacb9170428

    SHA256

    e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

    SHA512

    2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

  • C:\ProgramData\sqlite3.dll

    Filesize

    630KB

    MD5

    e477a96c8f2b18d6b5c27bde49c990bf

    SHA1

    e980c9bf41330d1e5bd04556db4646a0210f7409

    SHA256

    16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

    SHA512

    335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

  • C:\Users\Admin\AppData\Roaming\Bitcoin Wallet.exe

    Filesize

    264KB

    MD5

    17b3383a638c8e71894afdab1a2a5663

    SHA1

    4c26ddeab4ae5bc78bfd9002e021311c80ea0396

    SHA256

    4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f

    SHA512

    265a8dd85bc1c3e456e38734818f08faf4c71451082dca9dd7182c348284158ff31771eb4d2ebf6ee157640ee91825c90e57a326d17af7d72efae030af23fb5c

  • C:\Users\Admin\AppData\Roaming\Bitcoin Wallet.exe

    Filesize

    264KB

    MD5

    17b3383a638c8e71894afdab1a2a5663

    SHA1

    4c26ddeab4ae5bc78bfd9002e021311c80ea0396

    SHA256

    4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f

    SHA512

    265a8dd85bc1c3e456e38734818f08faf4c71451082dca9dd7182c348284158ff31771eb4d2ebf6ee157640ee91825c90e57a326d17af7d72efae030af23fb5c

  • C:\Users\Admin\AppData\Roaming\Bitcoin Wallet.exe

    Filesize

    264KB

    MD5

    17b3383a638c8e71894afdab1a2a5663

    SHA1

    4c26ddeab4ae5bc78bfd9002e021311c80ea0396

    SHA256

    4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f

    SHA512

    265a8dd85bc1c3e456e38734818f08faf4c71451082dca9dd7182c348284158ff31771eb4d2ebf6ee157640ee91825c90e57a326d17af7d72efae030af23fb5c

  • C:\Users\Admin\AppData\Roaming\svc host.exe

    Filesize

    140KB

    MD5

    397638390e9c49c10200a5cbd7a9ec7f

    SHA1

    e763d4cf6f005eac4fa683647d33ff9989069a90

    SHA256

    0b6a4f044f5e73cea182b412fe01dd6b93b959c29c477bb729facc9d6f648c0f

    SHA512

    11e1d3ddc3bc932e39462cf8c5f5f876edcdb609a29913c0d7775a9130e0634836aa1f0d5bc1fe66c4b0c8ceda429a135d3ded37ecb9fc8f36fe0a37b5b34701

  • C:\Users\Admin\AppData\Roaming\svc host.exe

    Filesize

    140KB

    MD5

    397638390e9c49c10200a5cbd7a9ec7f

    SHA1

    e763d4cf6f005eac4fa683647d33ff9989069a90

    SHA256

    0b6a4f044f5e73cea182b412fe01dd6b93b959c29c477bb729facc9d6f648c0f

    SHA512

    11e1d3ddc3bc932e39462cf8c5f5f876edcdb609a29913c0d7775a9130e0634836aa1f0d5bc1fe66c4b0c8ceda429a135d3ded37ecb9fc8f36fe0a37b5b34701

  • C:\Users\Admin\AppData\Roaming\svc host.exe

    Filesize

    140KB

    MD5

    397638390e9c49c10200a5cbd7a9ec7f

    SHA1

    e763d4cf6f005eac4fa683647d33ff9989069a90

    SHA256

    0b6a4f044f5e73cea182b412fe01dd6b93b959c29c477bb729facc9d6f648c0f

    SHA512

    11e1d3ddc3bc932e39462cf8c5f5f876edcdb609a29913c0d7775a9130e0634836aa1f0d5bc1fe66c4b0c8ceda429a135d3ded37ecb9fc8f36fe0a37b5b34701

  • memory/1500-153-0x00000000052E0000-0x00000000052EA000-memory.dmp

    Filesize

    40KB

  • memory/1500-148-0x0000000000400000-0x0000000000418000-memory.dmp

    Filesize

    96KB

  • memory/2460-144-0x0000000005640000-0x00000000056DC000-memory.dmp

    Filesize

    624KB

  • memory/2460-143-0x00000000055A0000-0x0000000005632000-memory.dmp

    Filesize

    584KB

  • memory/2460-141-0x0000000000CD0000-0x0000000000CFA000-memory.dmp

    Filesize

    168KB

  • memory/2460-142-0x0000000005B50000-0x00000000060F4000-memory.dmp

    Filesize

    5.6MB

  • memory/2464-140-0x0000000000AB0000-0x0000000000AFA000-memory.dmp

    Filesize

    296KB

  • memory/3076-150-0x0000000000400000-0x0000000000438000-memory.dmp

    Filesize

    224KB

  • memory/3076-146-0x0000000000400000-0x0000000000438000-memory.dmp

    Filesize

    224KB

  • memory/3076-154-0x0000000000400000-0x0000000000438000-memory.dmp

    Filesize

    224KB

  • memory/3076-152-0x0000000000400000-0x0000000000438000-memory.dmp

    Filesize

    224KB

  • memory/3076-159-0x0000000000400000-0x0000000000438000-memory.dmp

    Filesize

    224KB

  • memory/4960-132-0x0000000075320000-0x00000000758D1000-memory.dmp

    Filesize

    5.7MB

  • memory/4960-139-0x0000000075320000-0x00000000758D1000-memory.dmp

    Filesize

    5.7MB