Analysis

  • max time kernel
    141s
  • max time network
    148s
  • platform
    windows7_x64
  • resource
    win7-20230621-en
  • resource tags

    arch:x64arch:x86image:win7-20230621-enlocale:en-usos:windows7-x64system
  • submitted
    01-07-2023 07:01

General

  • Target

    Build2sexe.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\Build2sexe.exe
    "C:\Users\Admin\AppData\Local\Temp\Build2sexe.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:1616

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    344B

    MD5

    4a117bd6355b906083efdf53df140881

    SHA1

    4ddf7a9547471a16eaaf04259a4b488360f68846

    SHA256

    abec08de6f0e9f623dab0379133eb02ce18cdb7568f00d9de7f19d454c75e61d

    SHA512

    546cfff7201c246de5354943fdebae218dc4a2373844fcb1c7b3d496b4678df882d1d32e9c46a48bc7f98b7f132c60f1a177016211477fb8c4424032ea2bac60

  • C:\Users\Admin\AppData\Local\Temp\Cab58F0.tmp

    Filesize

    62KB

    MD5

    3ac860860707baaf32469fa7cc7c0192

    SHA1

    c33c2acdaba0e6fa41fd2f00f186804722477639

    SHA256

    d015145d551ecd14916270efad773bbc9fd57fad2228d2c24559f696c961d904

    SHA512

    d62ad2408c969a95550fb87efda50f988770ba5e39972041bf85924275baf156b8bec309ecc6409e5acdd37ec175dea40eff921ab58933b5b5b5d35a6147567c

  • C:\Users\Admin\AppData\Local\Temp\Tar599F.tmp

    Filesize

    164KB

    MD5

    4ff65ad929cd9a367680e0e5b1c08166

    SHA1

    c0af0d4396bd1f15c45f39d3b849ba444233b3a2

    SHA256

    c8733c93cc5aaf5ca206d06af22ee8dbdec764fb5085019a6a9181feb9dfdee6

    SHA512

    f530dc0d024a5a3b8903ffaaa41b608a5ccdd6da4ba1949f2c2e55a9fca475fec5c8d2119b5763cabe7ef1c3788fb9dcac621869db51d65b1d83cfe404fb4c27

  • C:\Users\Admin\AppData\Local\hBStbrK.sven\Files\ConvertToReceive.doc

    Filesize

    174KB

    MD5

    aa17355210eeb3c865e7f68cbbfeba55

    SHA1

    136e7aae8a1f201fcb243905e7ed8db38ebca03e

    SHA256

    bba82fd36704adf119480cc0a4dca337998b6c1a67adefb5a64cd7026748ab70

    SHA512

    83e5cf66e7ee9755567b289958b4c361ea4c2021c74604294a7a5de2e26be5702caa415db362244db4239dba8c081fa5d3533569721e7e32116b3c48f991e43d

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

    Filesize

    808B

    MD5

    a474d9dfdc7a7b20ed62e9273676b3d0

    SHA1

    4a78c6ca007d44b9e2b5a1d963dc9521328c3a08

    SHA256

    85953e584cd5a83a2a5575d2fb84b40c94edeabb73ee2825d3451bfb76345524

    SHA512

    aab0229736c1324a45937014c9316b6e8ab097c73c389a381717e82646709f4e20a7277265dac1382cb78cca3587f81b461b749ffca72c8e65352c1ae70893ac

  • memory/1616-54-0x0000000001030000-0x0000000001376000-memory.dmp

    Filesize

    3.3MB

  • memory/1616-55-0x0000000000570000-0x0000000000622000-memory.dmp

    Filesize

    712KB

  • memory/1616-56-0x000000001B5D0000-0x000000001B650000-memory.dmp

    Filesize

    512KB

  • memory/1616-57-0x000000001B5D0000-0x000000001B650000-memory.dmp

    Filesize

    512KB

  • memory/1616-73-0x000000001B1C0000-0x000000001B236000-memory.dmp

    Filesize

    472KB