Analysis

  • max time kernel
    11s
  • max time network
    12s
  • platform
    windows10-ltsc 2021_x64
  • resource
    win10ltsc2021-20250113-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20250113-enlocale:en-usos:windows10-ltsc 2021-x64system
  • submitted
    13-01-2025 18:32

General

  • Target

    Nonagon.exe

  • Size

    23KB

  • MD5

    1b554731ea6b94e44ab6fe7ec45eb153

  • SHA1

    1849707450548f79b4f8d941745c2c72199a7f00

  • SHA256

    f679075808adffca9a26ade94cc8494ccc500333e8613708e9ba077d88d92a70

  • SHA512

    96880df0242f41380e2877a3cac119e14ab062c4892040a3d8c9fe5fbc58ee6681729d1a1ca5c62427d4ad5ca76be1167d8811e9b4c35656e0c1000d660c06c1

  • SSDEEP

    384:LD5Ry1Yg5MsZHalPXhZAiWGVDNr2mtbQ2E65wMxsWSjRSiKM3EMtR:zymgSCh2Ey/GWSjRSiKM3Nt

Malware Config

Extracted

Family

phemedrone

C2

https://api.telegram.org/bot7940307483:AAEmmDBRKx8kRMTrlD986B7qCulYd2jfQHw/sendDocument

Extracted

Family

gurcu

C2

https://api.telegram.org/bot7940307483:AAEmmDBRKx8kRMTrlD986B7qCulYd2jfQHw/sendDocumen

Signatures

  • DcRat

    DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

  • Dcrat family
  • Detect Umbral payload 2 IoCs
  • Gurcu family
  • Gurcu, WhiteSnake

    Gurcu aka WhiteSnake is a malware stealer written in C#.

  • Phemedrone

    An information and wallet stealer written in C#.

  • Phemedrone family
  • Umbral

    Umbral stealer is an opensource moduler stealer written in C#.

  • Umbral family
  • DCRat payload 1 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Downloads MZ/PE file
  • Drops file in Drivers directory 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 4 IoCs
  • Reads data files stored by FTP clients 2 TTPs

    Tries to access configuration files associated with programs like FileZilla.

  • Reads user/profile data of web browsers 3 TTPs

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

  • Unsecured Credentials: Credentials In Files 1 TTPs

    Steal credentials from unsecured files.

  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 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.

  • Modifies WinLogon 2 TTPs 1 IoCs
  • Drops file in Program Files directory 1 IoCs
  • Drops file in Windows directory 14 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Modifies registry class 1 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 42 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 38 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Nonagon.exe
    "C:\Users\Admin\AppData\Local\Temp\Nonagon.exe"
    1⤵
    • Modifies WinLogon
    • Drops file in Program Files directory
    • Suspicious use of WriteProcessMemory
    PID:1956
    • C:\Program Files\WinRAR\RarExtPackage.exe
      "C:\Program Files\WinRAR\RarExtPackage.exe"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Drops file in Windows directory
      • System Location Discovery: System Language Discovery
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:4364
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Windows\debug\VUQLBafFd1oU7p3k.vbe"
        3⤵
        • System Location Discovery: System Language Discovery
        PID:348
      • C:\Windows\debug\wtf1.exe
        "C:\Windows\debug\wtf1.exe"
        3⤵
        • Drops file in Drivers directory
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3616
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic.exe" csproduct get uuid
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:3096
        • C:\Windows\SYSTEM32\attrib.exe
          "attrib.exe" +h +s "C:\Windows\debug\wtf1.exe"
          4⤵
          • Drops file in Windows directory
          • Views/modifies file attributes
          PID:2656
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Windows\debug\wtf1.exe'
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:3316
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "powershell.exe" Set-MpPreference -DisableIntrusionPreventionSystem $true -DisableIOAVProtection $true -DisableRealtimeMonitoring $true -DisableScriptScanning $true -EnableControlledFolderAccess Disabled -EnableNetworkProtection AuditMode -Force -MAPSReporting Disabled -SubmitSamplesConsent NeverSend && powershell Set-MpPreference -SubmitSamplesConsent 2
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          PID:2100
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          PID:3712
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          PID:3112
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic.exe" os get Caption
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          PID:3552
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic.exe" computersystem get totalphysicalmemory
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          PID:228
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic.exe" csproduct get uuid
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          PID:2408
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          PID:4060
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic" path win32_VideoController get name
          4⤵
          • Detects videocard installed
          • Suspicious behavior: EnumeratesProcesses
          PID:2028
        • C:\Windows\SYSTEM32\cmd.exe
          "cmd.exe" /c ping localhost && del /F /A h "C:\Windows\debug\wtf1.exe" && pause
          4⤵
          • System Network Configuration Discovery: Internet Connection Discovery
          • Suspicious use of WriteProcessMemory
          PID:4252
          • C:\Windows\system32\PING.EXE
            ping localhost
            5⤵
            • System Network Configuration Discovery: Internet Connection Discovery
            • Runs ping.exe
            PID:3548
      • C:\Windows\debug\wtf.exe
        "C:\Windows\debug\wtf.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:924
      • C:\Windows\debug\cs2.exe
        "C:\Windows\debug\cs2.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:4468

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Program Files\WinRAR\RarExtPackage.exe

    Filesize

    1.5MB

    MD5

    84d934c68349e798f58a35df1f2f90c2

    SHA1

    be0974e4699ff06f52f0d5d380bc9cb8f0c50e19

    SHA256

    3b7218b64c14fc5125a93b4f898886d3bb9c1bb69f0696ae557bb2b79fe8e8f6

    SHA512

    83ea4479e8536b015a628c0a8ca0662b269875f303bd0193ad551022c04105406001990f3b261c8201ec031d92047450debe1c915a2e361eddb80b48b876d335

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

    Filesize

    1KB

    MD5

    c67441dfa09f61bca500bb43407c56b8

    SHA1

    5a56cf7cbeb48c109e2128c31b681fac3959157b

    SHA256

    63082da456c124d0bc516d2161d1613db5f3008d903e4066d2c7b4e90b435f33

    SHA512

    325de8b718b3a01df05e20e028c5882240e5fd2e96c771361b776312923ff178f27494a1f5249bf6d7365a99155eb8735a51366e85597008e6a10462e63ee0e8

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

    Filesize

    948B

    MD5

    a9ab4419e3986b8e240c9478cc52eb51

    SHA1

    7e1b1b31bc47b9d4dccea76e6511d3632cb0395e

    SHA256

    87c993fd034df762cdf24506c046959e98985d38697b234f7ca092db49671846

    SHA512

    8f3d3ac39795b11719f40d3eb9a574576c8a5e6b837a1f3d63f7996faaf728e02ec5e26f4bed71ab850c9fa9272ec94fb6449b251eadc82672f84bdd5ec256a6

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

    Filesize

    1KB

    MD5

    8e1fdd1b66d2fee9f6a052524d4ddca5

    SHA1

    0a9d0994559d1be2eecd8b0d6960540ca627bdb6

    SHA256

    4cc7c1b79d1b48582d4dc27ca8c31457b9bf2441deb7914399bb9e6863f18b13

    SHA512

    5a5494b878b08e8515811ab7a3d68780dac7423f5562477d98249a8bedf7ec98567b7cd5d4c6967d6bc63f2d6d9b7da9a65e0eb29d4b955026b469b5b598d1f3

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

    Filesize

    1KB

    MD5

    3cd1b473bd9fb31842aea30f9d605524

    SHA1

    b4a28365cb5a1d6799c93b16f179ba7b2e614104

    SHA256

    a5db10355284cf19f3bbb2270159d4cb5771c00cf3ec885912181ffd637ac1c9

    SHA512

    b0fe7e3da43ab3159030e9764b9f6d81c6aa69b0cbf461902c0e4ab14e51a7b9095a787202a03cc1adcb22f562c23fcd728bd46e348342d2bb692851350a71f6

  • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_mmbsxeim.smw.ps1

    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

  • C:\Windows\debug\VUQLBafFd1oU7p3k.vbe

    Filesize

    217B

    MD5

    f9ed37928a0d95692faa9f69d0cd5cb7

    SHA1

    77c2968f3d2ba8afb128307105861734b4fce286

    SHA256

    61ac997d454ae62b6025b60e2ac9f1c7031cf380f3d9d1395de3cd816d35554a

    SHA512

    cbe7954def42abac38dde5ba9f9fbc341e8e9161a9b0826e9fe779541fdf2b0057402d9c3dab608a9b01dc9c3229a122e13ac71bd52be978adbd628d16867b79

  • C:\Windows\debug\cs2.exe

    Filesize

    137KB

    MD5

    509f2eeba11a964fa8d22ab6994cee78

    SHA1

    544321089bbc1cbc6e51eabcfcb0c042f797142c

    SHA256

    21c7ecd4074b68a2d59b6b241037392a0f1ee2d6450fa3c72a3895f3563d5a2a

    SHA512

    f6eed65466977ef5b775e9dd1c204790b901e64bebc648e71b38062dd5d9207cc53fbfa4bf7b170dfc1fa41bfb1570cb6527863d9abe5d03efc49eedc5487cf0

  • C:\Windows\debug\wtf.exe

    Filesize

    265KB

    MD5

    47ba0b9187c62981c229372477e2b2a0

    SHA1

    9c861ee21eb30ec6aa35b02bd437f70c2ac25eee

    SHA256

    93a0a5f1d487c699ba0809428c732bb0d741bc41b4459490b24d9b03ee3183fc

    SHA512

    2a65a3b52751ce99918ab3e01db1cc21e08e5a5069fd0256a6601a3aee5d2d75ce842c9eeb147cd7d76612b0ab8f86adee2eab3fea8e410f55c8061a690585c7

  • C:\Windows\debug\wtf1.exe

    Filesize

    229KB

    MD5

    187795687849f43176bc94aff323435f

    SHA1

    22e3d510df771291a2a256946ac6268ccf5d10be

    SHA256

    d7ebf40f863050be539cd8cbba2463c48235aa509819ed3b066a1c0b4974203e

    SHA512

    b099c9cbd3f5d9cd44dae19c66e88d32e5c290fa3f8cd6818397b54f2f73d318738d96b295053254bed4f254a2ebdfb2a8e75402e61314343060447888d781a3

  • memory/924-76-0x00000285650F0000-0x0000028565136000-memory.dmp

    Filesize

    280KB

  • memory/3316-87-0x000001DED45A0000-0x000001DED45C2000-memory.dmp

    Filesize

    136KB

  • memory/3616-105-0x000001E32EBE0000-0x000001E32EC30000-memory.dmp

    Filesize

    320KB

  • memory/3616-106-0x000001E32EBC0000-0x000001E32EBDE000-memory.dmp

    Filesize

    120KB

  • memory/3616-104-0x000001E32EE80000-0x000001E32EEF6000-memory.dmp

    Filesize

    472KB

  • memory/3616-130-0x000001E32EF10000-0x000001E32EF1A000-memory.dmp

    Filesize

    40KB

  • memory/3616-131-0x000001E32F050000-0x000001E32F062000-memory.dmp

    Filesize

    72KB

  • memory/3616-70-0x000001E314660000-0x000001E3146A0000-memory.dmp

    Filesize

    256KB

  • memory/3616-149-0x000001E32EA90000-0x000001E32EB8F000-memory.dmp

    Filesize

    1020KB

  • memory/4468-80-0x0000028CEABC0000-0x0000028CEABE8000-memory.dmp

    Filesize

    160KB