Analysis

  • max time kernel
    82s
  • max time network
    145s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21-03-2023 13:24

General

  • Target

    7a6db8aecc2376ec7dfc50085757841523fb69135e364b70c7319bf7a39209d7.exe

  • Size

    2.9MB

  • MD5

    68a23c2fc62bddad0a2c6cf36003577b

  • SHA1

    67a19bf734520933adfa28afc017c3af1d6a3d5b

  • SHA256

    7a6db8aecc2376ec7dfc50085757841523fb69135e364b70c7319bf7a39209d7

  • SHA512

    0386671ee83c0825f80a0c95b4e21eb23054878546aff5d8ef63a3bcc6a32c53a61397009aee8e8c5fc171b1ed0e9b69a31111eb1b860e1ff67264fcac806cef

  • SSDEEP

    24576:plubLwtFDS7FYNYD7264xnRhc/LSXxH227hqRCeFcOziFJLUfdKTgWA22222222:gZ7h4xnRhcGXxHxOqdq1pup

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

SUCCESS

C2

41.185.97.216:4782

Mutex

MUTEX_QAxMFzrXWG2cbIHPGK

Attributes
  • encryption_key

    4DwUV8AnxPgmXSMeThKb

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    cmd

  • subdirectory

    SubDir

Signatures

  • Quasar RAT 3 IoCs

    Quasar is an open source Remote Access Tool.

  • Quasar payload 1 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Executes dropped EXE 2 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 31 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\7a6db8aecc2376ec7dfc50085757841523fb69135e364b70c7319bf7a39209d7.exe
    "C:\Users\Admin\AppData\Local\Temp\7a6db8aecc2376ec7dfc50085757841523fb69135e364b70c7319bf7a39209d7.exe"
    1⤵
    • Quasar RAT
    • Checks computer location settings
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1264
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1320
    • C:\Users\Admin\AppData\Local\Temp\7a6db8aecc2376ec7dfc50085757841523fb69135e364b70c7319bf7a39209d7.exe
      C:\Users\Admin\AppData\Local\Temp\7a6db8aecc2376ec7dfc50085757841523fb69135e364b70c7319bf7a39209d7.exe
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2936
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "cmd" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\7a6db8aecc2376ec7dfc50085757841523fb69135e364b70c7319bf7a39209d7.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:4668
      • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
        "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
        3⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Adds Run key to start application
        • Suspicious use of SetThreadContext
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3232
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:3656
        • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
          C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
          4⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:3464
          • C:\Windows\SysWOW64\schtasks.exe
            "schtasks" /create /tn "cmd" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
            5⤵
            • Creates scheduled task(s)
            PID:1792

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\7a6db8aecc2376ec7dfc50085757841523fb69135e364b70c7319bf7a39209d7.exe.log
    Filesize

    1KB

    MD5

    7e88081fcf716d85992bb3af3d9b6454

    SHA1

    2153780fbc71061b0102a7a7b665349e1013e250

    SHA256

    5ffb4a3ea94a6a53c4f88e2191c6fec5fd8a7336e367aa113fe8c12631e0c4d2

    SHA512

    ec606e14367ae221c04f213a61a6f797034495121198e4788e3afa4aa8db67bf59c5c5210a56afae5557158e8923b013b371b84c7d64303618c5b4c57a2224f7

  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log
    Filesize

    1KB

    MD5

    4280e36a29fa31c01e4d8b2ba726a0d8

    SHA1

    c485c2c9ce0a99747b18d899b71dfa9a64dabe32

    SHA256

    e2486a1bdcba80dad6dd6210d7374bd70ae196a523c06ceda71370fd3ea78359

    SHA512

    494fe5f0ade03669e5830bed93c964d69b86629440148d7b0881cf53203fd89443ebff9b4d1ee9d96244f62af6edede622d9eacba37f80f389a0d522e4ad4ea4

  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\ModuleAnalysisCache
    Filesize

    53KB

    MD5

    06ad34f9739c5159b4d92d702545bd49

    SHA1

    9152a0d4f153f3f40f7e606be75f81b582ee0c17

    SHA256

    474813b625f00710f29fa3b488235a6a22201851efb336bddf60d7d24a66bfba

    SHA512

    c272cd28ae164d465b779163ba9eca6a28261376414c6bbdfbd9f2128adb7f7ff1420e536b4d6000d0301ded2ec9036bc5c657588458bff41f176bdce8d74f92

  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
    Filesize

    16KB

    MD5

    9d23fd09b5ed3e198eb27a399d6ab793

    SHA1

    529452ad771d734994bc3a766a3d27df05945551

    SHA256

    aa2b7df9bb59c310000392e7902801b31734f45dc22e92f9cd4492ff1e79aff7

    SHA512

    a184656aad72ffb2f4221761b435a4adfe844713a129f5500228888838a53976aaaeeae6c6ea3d4574a5f8d7410dc4a3fd4056164cabdf15e5f18c587a5f0eba

  • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_mcyeq2r0.xil.ps1
    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

  • C:\Users\Admin\AppData\Roaming\Saizfrsak\Omjvs.exe
    MD5

    d41d8cd98f00b204e9800998ecf8427e

    SHA1

    da39a3ee5e6b4b0d3255bfef95601890afd80709

    SHA256

    e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

    SHA512

    cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
    Filesize

    2.9MB

    MD5

    68a23c2fc62bddad0a2c6cf36003577b

    SHA1

    67a19bf734520933adfa28afc017c3af1d6a3d5b

    SHA256

    7a6db8aecc2376ec7dfc50085757841523fb69135e364b70c7319bf7a39209d7

    SHA512

    0386671ee83c0825f80a0c95b4e21eb23054878546aff5d8ef63a3bcc6a32c53a61397009aee8e8c5fc171b1ed0e9b69a31111eb1b860e1ff67264fcac806cef

  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
    Filesize

    2.9MB

    MD5

    68a23c2fc62bddad0a2c6cf36003577b

    SHA1

    67a19bf734520933adfa28afc017c3af1d6a3d5b

    SHA256

    7a6db8aecc2376ec7dfc50085757841523fb69135e364b70c7319bf7a39209d7

    SHA512

    0386671ee83c0825f80a0c95b4e21eb23054878546aff5d8ef63a3bcc6a32c53a61397009aee8e8c5fc171b1ed0e9b69a31111eb1b860e1ff67264fcac806cef

  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
    Filesize

    2.9MB

    MD5

    68a23c2fc62bddad0a2c6cf36003577b

    SHA1

    67a19bf734520933adfa28afc017c3af1d6a3d5b

    SHA256

    7a6db8aecc2376ec7dfc50085757841523fb69135e364b70c7319bf7a39209d7

    SHA512

    0386671ee83c0825f80a0c95b4e21eb23054878546aff5d8ef63a3bcc6a32c53a61397009aee8e8c5fc171b1ed0e9b69a31111eb1b860e1ff67264fcac806cef

  • memory/1264-155-0x00000000033D0000-0x00000000033E0000-memory.dmp
    Filesize

    64KB

  • memory/1264-133-0x0000000000CD0000-0x0000000000FBA000-memory.dmp
    Filesize

    2.9MB

  • memory/1264-135-0x0000000005CE0000-0x0000000005D02000-memory.dmp
    Filesize

    136KB

  • memory/1264-134-0x00000000033D0000-0x00000000033E0000-memory.dmp
    Filesize

    64KB

  • memory/1320-151-0x0000000005F30000-0x0000000005F4E000-memory.dmp
    Filesize

    120KB

  • memory/1320-150-0x0000000004AD0000-0x0000000004AE0000-memory.dmp
    Filesize

    64KB

  • memory/1320-156-0x0000000004AD0000-0x0000000004AE0000-memory.dmp
    Filesize

    64KB

  • memory/1320-157-0x0000000004AD0000-0x0000000004AE0000-memory.dmp
    Filesize

    64KB

  • memory/1320-158-0x0000000004AD0000-0x0000000004AE0000-memory.dmp
    Filesize

    64KB

  • memory/1320-136-0x0000000002940000-0x0000000002976000-memory.dmp
    Filesize

    216KB

  • memory/1320-153-0x0000000006430000-0x000000000644A000-memory.dmp
    Filesize

    104KB

  • memory/1320-154-0x0000000004AD0000-0x0000000004AE0000-memory.dmp
    Filesize

    64KB

  • memory/1320-137-0x0000000005110000-0x0000000005738000-memory.dmp
    Filesize

    6.2MB

  • memory/1320-138-0x0000000005740000-0x00000000057A6000-memory.dmp
    Filesize

    408KB

  • memory/1320-139-0x00000000058A0000-0x0000000005906000-memory.dmp
    Filesize

    408KB

  • memory/1320-149-0x0000000004AD0000-0x0000000004AE0000-memory.dmp
    Filesize

    64KB

  • memory/1320-152-0x0000000007570000-0x0000000007BEA000-memory.dmp
    Filesize

    6.5MB

  • memory/2936-166-0x0000000005980000-0x0000000005F24000-memory.dmp
    Filesize

    5.6MB

  • memory/2936-167-0x0000000005470000-0x0000000005502000-memory.dmp
    Filesize

    584KB

  • memory/2936-170-0x0000000006810000-0x000000000684C000-memory.dmp
    Filesize

    240KB

  • memory/2936-169-0x00000000062B0000-0x00000000062C2000-memory.dmp
    Filesize

    72KB

  • memory/2936-168-0x0000000005520000-0x0000000005530000-memory.dmp
    Filesize

    64KB

  • memory/2936-163-0x0000000000400000-0x000000000045E000-memory.dmp
    Filesize

    376KB

  • memory/3232-190-0x00000000056C0000-0x00000000056D0000-memory.dmp
    Filesize

    64KB

  • memory/3232-175-0x00000000056C0000-0x00000000056D0000-memory.dmp
    Filesize

    64KB

  • memory/3464-199-0x00000000054F0000-0x0000000005500000-memory.dmp
    Filesize

    64KB

  • memory/3464-201-0x0000000006F20000-0x0000000006F2A000-memory.dmp
    Filesize

    40KB

  • memory/3464-202-0x00000000054F0000-0x0000000005500000-memory.dmp
    Filesize

    64KB

  • memory/3656-189-0x0000000005190000-0x00000000051A0000-memory.dmp
    Filesize

    64KB

  • memory/3656-191-0x0000000005190000-0x00000000051A0000-memory.dmp
    Filesize

    64KB

  • memory/3656-192-0x0000000005190000-0x00000000051A0000-memory.dmp
    Filesize

    64KB

  • memory/3656-188-0x0000000005190000-0x00000000051A0000-memory.dmp
    Filesize

    64KB