Analysis

  • max time kernel
    141s
  • max time network
    151s
  • platform
    windows7_x64
  • resource
    win7-20230621-en
  • resource tags

    arch:x64arch:x86image:win7-20230621-enlocale:en-usos:windows7-x64system
  • submitted
    30-06-2023 12:06

General

  • Target

    Build_2s.exe

  • Size

    3.3MB

  • MD5

    1c2b15ed1c8897bb466ec6f1a0f3e815

  • SHA1

    b2faf832c9a2e0d7210374560cfff65406659884

  • SHA256

    eb405e175ae16fd8877aa87ffdb39f0d4f41cf7c77351708d84f44dd790c35d2

  • SHA512

    9df20f4a26972e6bbc5ce2e01a139793077781900f5c304a4239f52d73c1b1653a58f21c725b95371fe5ac4106761dae7b90b71722ee32a87c19517a0d4f8961

  • SSDEEP

    98304:4QBNUcwti78OqJ7TPBsHgMWJ0bJpqcV/:/zUcwti7TQlsBWJq1x

Malware Config

Extracted

Family

blackguard

C2

http://94.142.138.111

Signatures

  • BlackGuard

    Infostealer first seen in Late 2021.

  • Downloads MZ/PE file
  • Allows Network login with blank passwords 1 TTPs 1 IoCs

    Allows local user accounts with blank passwords to access device from the network.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
  • Adds Run key to start application 2 TTPs 1 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.

  • Drops autorun.inf file 1 TTPs 1 IoCs

    Malware can abuse Windows Autorun to spread further via attached volumes.

  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 10 IoCs
  • Modifies system certificate store 2 TTPs 6 IoCs
  • Suspicious behavior: EnumeratesProcesses 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Build_2s.exe
    "C:\Users\Admin\AppData\Local\Temp\Build_2s.exe"
    1⤵
    • Allows Network login with blank passwords
    • Accesses Microsoft Outlook profiles
    • Adds Run key to start application
    • Drops autorun.inf file
    • Modifies registry class
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • outlook_office_path
    • outlook_win_path
    PID:1200

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015

    Filesize

    344B

    MD5

    d09929b081d1dd2d832749db7e74bebe

    SHA1

    837973314c5b80b916c65245a4810bc13334a517

    SHA256

    7f07406fd74cd7306ccc8f88f001ce48f0675e699ae06c2db9d457066d8f1cd8

    SHA512

    584e062cabf16c4c7d7368dc04f2fb89c583fee2fa9e5aaf32df0d86255ebf323d444283ac1bf422f8737145049e64db9e3e20569f18f98cc3c632fa28f8411c

  • C:\Users\Admin\AppData\Local\Temp\Cab2F51.tmp

    Filesize

    62KB

    MD5

    3ac860860707baaf32469fa7cc7c0192

    SHA1

    c33c2acdaba0e6fa41fd2f00f186804722477639

    SHA256

    d015145d551ecd14916270efad773bbc9fd57fad2228d2c24559f696c961d904

    SHA512

    d62ad2408c969a95550fb87efda50f988770ba5e39972041bf85924275baf156b8bec309ecc6409e5acdd37ec175dea40eff921ab58933b5b5b5d35a6147567c

  • C:\Users\Admin\AppData\Local\Temp\Tar2FE1.tmp

    Filesize

    164KB

    MD5

    4ff65ad929cd9a367680e0e5b1c08166

    SHA1

    c0af0d4396bd1f15c45f39d3b849ba444233b3a2

    SHA256

    c8733c93cc5aaf5ca206d06af22ee8dbdec764fb5085019a6a9181feb9dfdee6

    SHA512

    f530dc0d024a5a3b8903ffaaa41b608a5ccdd6da4ba1949f2c2e55a9fca475fec5c8d2119b5763cabe7ef1c3788fb9dcac621869db51d65b1d83cfe404fb4c27

  • C:\Users\Admin\AppData\Local\hBStbrK.sven\Files\MountClose.docx

    Filesize

    767KB

    MD5

    1914ec161267b8d468c73967c86d8e86

    SHA1

    fc52b4d83dca9591dc1ce073e0beeb16bc397995

    SHA256

    24faa8d7ad5ff0f39edc7e17ef908c5459488a646b0e45c80e96ba15751e04ef

    SHA512

    946ca96ddfb74ec910cea7b3034056db94d7a9d012cd15496fe2398010664b1f594ea45a9b0345bd2784a840175e9152d831ce930617aa5ce212e8bb24e83038

  • C:\Users\Admin\AppData\Local\hBStbrK.sven\sysInformation.txt

    Filesize

    809B

    MD5

    8f6185c70be3c74bee5cf42341ddbf29

    SHA1

    81f7648346956a8c05c2d4361e1a2ac0b7c6636d

    SHA256

    5054a960a18293d17ae8cefe5658cde1e5372637bf817fa318d0d290933402f5

    SHA512

    000d09ce185ef2f8282cc01f9529205920ccb5ebedf00f91ff6681bd25b1ee37d1c2899d148fc17121cdadb8ba34986ddac56184a4ef5ac73f7b61783ce0c662

  • memory/1200-54-0x0000000000B90000-0x0000000000ED6000-memory.dmp

    Filesize

    3.3MB

  • memory/1200-55-0x0000000000AC0000-0x0000000000B72000-memory.dmp

    Filesize

    712KB

  • memory/1200-56-0x000000001B1F0000-0x000000001B270000-memory.dmp

    Filesize

    512KB

  • memory/1200-57-0x000000001B1F0000-0x000000001B270000-memory.dmp

    Filesize

    512KB

  • memory/1200-69-0x000000001B600000-0x000000001B676000-memory.dmp

    Filesize

    472KB