Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-20230712-en
  • resource tags

    arch:x64arch:x86image:win7-20230712-enlocale:en-usos:windows7-x64system
  • submitted
    15-08-2023 18:13

General

  • Target

    tmp.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.

  • 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

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmp.exe
    "C:\Users\Admin\AppData\Local\Temp\tmp.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1500
    • 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
      • Adds Run key to start application
      • Modifies registry class
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2988

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    344B

    MD5

    5ff9c175124acd500c4b4a91c2088ec8

    SHA1

    a97d49f27ce1f402f209cc0a71d7e33c7c0abea8

    SHA256

    9a66a520c0547f8e077d57ef343ecd8ccbb57f9d5a3992c007b4f73593374088

    SHA512

    5b2dce40cf1662917a2c57448a9ecdcf8b3078307ff25434e3d80c35bd7a70d57c3626bd5af4095599f2ab49832426013b47c737229c78442de4dc48a41c7ea6

  • C:\Users\Admin\AppData\Local\Temp\CabC74B.tmp

    Filesize

    62KB

    MD5

    3ac860860707baaf32469fa7cc7c0192

    SHA1

    c33c2acdaba0e6fa41fd2f00f186804722477639

    SHA256

    d015145d551ecd14916270efad773bbc9fd57fad2228d2c24559f696c961d904

    SHA512

    d62ad2408c969a95550fb87efda50f988770ba5e39972041bf85924275baf156b8bec309ecc6409e5acdd37ec175dea40eff921ab58933b5b5b5d35a6147567c

  • C:\Users\Admin\AppData\Local\Temp\TarC970.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\ConvertWait.doc

    Filesize

    540KB

    MD5

    cfba7267fd0ffe1bf8909d085981920e

    SHA1

    c0c94409e5ca30615efa4f1f6b4927540710bfde

    SHA256

    6027d14b936cc3f37ef0748ed72a00c995f2cfadc692a2e2894188d58a7e138d

    SHA512

    1113be17c112286608b83011d971fdd41e2df36c83af0ca6840d6eaed7fbcd52038c32cb9ca780d499a92b424f360bfd3f74aa56bb474c72c9066000b00ef2a1

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

    Filesize

    808B

    MD5

    a2e8295a56c0f6289152dfb91693e90b

    SHA1

    c2a2d12f71a09353cfcaaa9d8c662db350178117

    SHA256

    46c2869e2d9d5f228680193561571d3db97337f370514bae2af3b404744e99d0

    SHA512

    372274f229760308b47ef39365eaf4f25b834478b7ac06fdbd400da20190707229a9cbcce6a935be6aaccb5c1445336b5a8172a91fa7501d6a186d6391c088e9

  • memory/1500-59-0x000000001B1C0000-0x000000001B240000-memory.dmp

    Filesize

    512KB

  • memory/1500-64-0x000007FEF5DB0000-0x000007FEF679C000-memory.dmp

    Filesize

    9.9MB

  • memory/1500-57-0x000007FEF5DB0000-0x000007FEF679C000-memory.dmp

    Filesize

    9.9MB

  • memory/1500-56-0x000000001B1C0000-0x000000001B240000-memory.dmp

    Filesize

    512KB

  • memory/1500-54-0x0000000001320000-0x000000000133A000-memory.dmp

    Filesize

    104KB

  • memory/1500-55-0x000007FEF5DB0000-0x000007FEF679C000-memory.dmp

    Filesize

    9.9MB

  • memory/2988-67-0x000000001AC00000-0x000000001AC80000-memory.dmp

    Filesize

    512KB

  • memory/2988-81-0x000000001AC00000-0x000000001AC80000-memory.dmp

    Filesize

    512KB

  • memory/2988-83-0x000000001BA40000-0x000000001BAB6000-memory.dmp

    Filesize

    472KB

  • memory/2988-80-0x000007FEF5DB0000-0x000007FEF679C000-memory.dmp

    Filesize

    9.9MB

  • memory/2988-79-0x000000001C9C0000-0x000000001CCEE000-memory.dmp

    Filesize

    3.2MB

  • memory/2988-68-0x0000000000A90000-0x0000000000B42000-memory.dmp

    Filesize

    712KB

  • memory/2988-65-0x0000000000F00000-0x000000000124A000-memory.dmp

    Filesize

    3.3MB

  • memory/2988-66-0x000007FEF5DB0000-0x000007FEF679C000-memory.dmp

    Filesize

    9.9MB