Analysis

  • max time kernel
    115s
  • max time network
    152s
  • 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

    Build1.exe

  • Size

    115KB

  • MD5

    bfaa027a645e567824a10a26fb8dbefd

  • SHA1

    4ab52a0b1cc105a5462c2255ef84be9af431b82e

  • SHA256

    c67b6f45d0beb461838f87ca2ad4774b52d7ccf9b0fa36652e8642dc72f43302

  • SHA512

    2f7ab0e4451cfeec017ba294cfcbc6f02d85c756bebce1cf9b3c69f6c77386fe9a21897734c44f4aa32dcaf3a1b7fbaaf0c4639edab1c8961761767a656b4569

  • SSDEEP

    1536:ztCbuEYE+9z2wpuFavGmhMnDIhzZtz20tnh/:5CbuAsEFNmhMnDIhNI0tnh/

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.

  • Executes dropped EXE 1 IoCs
  • 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.

  • 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 2 IoCs
  • Suspicious use of WriteProcessMemory 3 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Build1.exe
    "C:\Users\Admin\AppData\Local\Temp\Build1.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1964
    • C:\Users\Admin\AppData\Local\Temp\dtsmsys.exe
      "C:\Users\Admin\AppData\Local\Temp\dtsmsys.exe"
      2⤵
      • Allows Network login with blank passwords
      • Executes dropped EXE
      • Accesses Microsoft Outlook profiles
      • Adds Run key to start application
      • Modifies registry class
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • outlook_office_path
      • outlook_win_path
      PID:464

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    344B

    MD5

    a4b935f47f43ce2b60e2238342fdf5a8

    SHA1

    76e0314d64284a818b4695f1862843d64e9ea1cc

    SHA256

    9965335ef4a39f404f85ad8204b6f133d42ee8d5f5d6db6ff968a41e11ea1cde

    SHA512

    4330c5421d90f384ebf0740a62084148b30eae702de036a520a87d348cea28d67f86cc29acb13c0e42fe38f8b11f8bc68e8ad19dffc8a7b3e15e6d9fdcc3ae9d

  • C:\Users\Admin\AppData\Local\Temp\CabB0FE.tmp

    Filesize

    62KB

    MD5

    3ac860860707baaf32469fa7cc7c0192

    SHA1

    c33c2acdaba0e6fa41fd2f00f186804722477639

    SHA256

    d015145d551ecd14916270efad773bbc9fd57fad2228d2c24559f696c961d904

    SHA512

    d62ad2408c969a95550fb87efda50f988770ba5e39972041bf85924275baf156b8bec309ecc6409e5acdd37ec175dea40eff921ab58933b5b5b5d35a6147567c

  • C:\Users\Admin\AppData\Local\Temp\TarB1BD.tmp

    Filesize

    164KB

    MD5

    4ff65ad929cd9a367680e0e5b1c08166

    SHA1

    c0af0d4396bd1f15c45f39d3b849ba444233b3a2

    SHA256

    c8733c93cc5aaf5ca206d06af22ee8dbdec764fb5085019a6a9181feb9dfdee6

    SHA512

    f530dc0d024a5a3b8903ffaaa41b608a5ccdd6da4ba1949f2c2e55a9fca475fec5c8d2119b5763cabe7ef1c3788fb9dcac621869db51d65b1d83cfe404fb4c27

  • C:\Users\Admin\AppData\Local\Temp\dtsmsys.exe

    Filesize

    3.4MB

    MD5

    e695b8888af3b57f1a56961bd289463c

    SHA1

    e8c3892fcf4635a16fe91b9542953e2ac5141df2

    SHA256

    c5a45793d7c361f18d36c190b86c951bf0e7a01ad52132c7e9e9d4101eff73aa

    SHA512

    3c1ba39b7819020ad748bfd8bc0cca01fda5e5c7a2111ec6c034bf99e1974f27cb6a1ad7b3e26ffcfb150c447349661771fd21d54c25602ab01c1b1b43346ce1

  • C:\Users\Admin\AppData\Local\Temp\dtsmsys.exe

    Filesize

    3.4MB

    MD5

    e695b8888af3b57f1a56961bd289463c

    SHA1

    e8c3892fcf4635a16fe91b9542953e2ac5141df2

    SHA256

    c5a45793d7c361f18d36c190b86c951bf0e7a01ad52132c7e9e9d4101eff73aa

    SHA512

    3c1ba39b7819020ad748bfd8bc0cca01fda5e5c7a2111ec6c034bf99e1974f27cb6a1ad7b3e26ffcfb150c447349661771fd21d54c25602ab01c1b1b43346ce1

  • C:\Users\Admin\AppData\Local\hndtbrK.FEror\Files\JoinCompress.docx

    Filesize

    835KB

    MD5

    1819e85ee94069ba9af921aa33354586

    SHA1

    9efbf2cf19922f8b004f303dab2ddc258308416b

    SHA256

    c7192bc38a5d6d881e6173d7ce7548604d63b75e93726db7c4281b6a306bf873

    SHA512

    34b8f60c15b4f65d37e0afd7cffec1d29fd1c2d798b0ebbdebba1df63f51e0df7722126140c8b65adcd1e6e7df0ce1cbf348280a6bc1e311b98c7867f1c02237

  • C:\Users\Admin\AppData\Local\hndtbrK.FEror\sysInformation.txt

    Filesize

    809B

    MD5

    5e73682467f6cc3b9095e50de96bad38

    SHA1

    a337e003203759d26c2c0585b5c4a77cdc8eec29

    SHA256

    1a7ff39ea058bdf41ddcd6e3c05ed81ea654a3db3d820a4c02b324f646a4c2ce

    SHA512

    6254727e7b0515a5980f91692c4624aaffa2b2744a7f9c4be75c13a92793a63178eaac47e1912f623beada7873d34540a8190eefba4392b4d95bb49faf74f6b2

  • memory/464-64-0x000000001B090000-0x000000001B110000-memory.dmp

    Filesize

    512KB

  • memory/464-76-0x000000001CDD0000-0x000000001D0FE000-memory.dmp

    Filesize

    3.2MB

  • memory/464-78-0x000000001A9D0000-0x000000001AA46000-memory.dmp

    Filesize

    472KB

  • memory/464-63-0x000000001B3F0000-0x000000001B4A2000-memory.dmp

    Filesize

    712KB

  • memory/464-94-0x000000001B090000-0x000000001B110000-memory.dmp

    Filesize

    512KB

  • memory/464-62-0x00000000002D0000-0x000000000061A000-memory.dmp

    Filesize

    3.3MB

  • memory/1964-54-0x0000000000CD0000-0x0000000000CEA000-memory.dmp

    Filesize

    104KB

  • memory/1964-57-0x000000001A810000-0x000000001A890000-memory.dmp

    Filesize

    512KB

  • memory/1964-55-0x000000001A810000-0x000000001A890000-memory.dmp

    Filesize

    512KB