Analysis

  • max time kernel
    104s
  • max time network
    118s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09-09-2024 21:52

General

  • Target

    4bb8a2bcc007cc041fe3c03c25453920N.exe

  • Size

    3.5MB

  • MD5

    4bb8a2bcc007cc041fe3c03c25453920

  • SHA1

    e922394a6f90243985b305efb9e4caed04483d40

  • SHA256

    9b90f637ef1988d0b812882cc1455f1ca87b8eef2017d92ec438734b02eebe36

  • SHA512

    40cc3a02511bd4b899824aeb70867218220f7797e100daf625b364f899ec3c58d8c129fe0b17c445683e0968beb5abc25262707fa074f9ef85b26da31cb7cddd

  • SSDEEP

    49152:k9bxPRDP0fHuNSeZUZzWHehOQ1750lGurq4bx67oICjhTLCUA/bIHvWdW9dX8dvz:m5Rjb1Zc/hOQkvq407ozFmAeW9Wvz

Malware Config

Extracted

Family

umbral

C2

https://os1.olympus-entertainment.com

Signatures

  • Detect Umbral payload 3 IoCs
  • Umbral

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

  • Credentials from Password Stores: Credentials from Web Browsers 1 TTPs

    Malicious Access or copy of Web Browser Credential store.

  • Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs
  • 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.

  • Drops file in Drivers directory 1 IoCs
  • Checks BIOS information in registry 2 TTPs 2 IoCs

    BIOS information is often read in order to detect sandboxing environments.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Themida packer 3 IoCs

    Detects Themida, an advanced Windows software protection system.

  • Checks whether UAC is enabled 1 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.

  • Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 10 IoCs

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

  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Suspicious behavior: EnumeratesProcesses 12 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 27 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\4bb8a2bcc007cc041fe3c03c25453920N.exe
    "C:\Users\Admin\AppData\Local\Temp\4bb8a2bcc007cc041fe3c03c25453920N.exe"
    1⤵
    • Identifies VirtualBox via ACPI registry values (likely anti-VM)
    • Drops file in Drivers directory
    • Checks BIOS information in registry
    • Checks whether UAC is enabled
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2904
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\4bb8a2bcc007cc041fe3c03c25453920N.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2392
    • C:\Windows\SysWOW64\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
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2944
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:536
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3212
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      PID:3512
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      PID:2364
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4364
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      PID:3712
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic" path win32_VideoController get name
      2⤵
      • System Location Discovery: System Language Discovery
      • Detects videocard installed
      PID:3764

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    2KB

    MD5

    968cb9309758126772781b83adb8a28f

    SHA1

    8da30e71accf186b2ba11da1797cf67f8f78b47c

    SHA256

    92099c10776bb7e3f2a8d1b82d4d40d0c4627e4f1bf754a6e58dfd2c2e97042a

    SHA512

    4bd50732f8af4d688d95999bddfd296115d7033ddc38f86c9fb1f47fde202bffa27e9088bebcaa3064ca946af2f5c1ca6cbde49d0907f0005c7ab42874515dd3

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

    Filesize

    15KB

    MD5

    f2b858bccbfbe367803e0d9474661b50

    SHA1

    50b6ac7628a9b06ed9412b402deede3b9982d31a

    SHA256

    1a0737699c3de2fa948cf8b6f8fc6e3049b28676098555407447eada52caa6b8

    SHA512

    7d47b7d25cd107a8d673268eb2a5461f18e2ed55178a735a6e4f348183ba64f48cd754bf2e3d2bf4dd412e6193e8d34e4db81e73fb33e31122b8790159c2a772

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

    Filesize

    18KB

    MD5

    00866e23f533a25aada0fd00116d358c

    SHA1

    a941554ac091245bf2a429030a43b604d10d69e7

    SHA256

    1f395f2d8f72be0e3100ad648742ca2fe3eb6070611a696dceb6846cce2fc2b4

    SHA512

    76e061e3c76813b911c4d097faa3af898aabd835182596c24391f91af36f37176074f7db58a0a2e09850ac711c57e211e983889a2c05188e2cb56030c27b6aac

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

    Filesize

    17KB

    MD5

    bf4b76055fe3c344ac993ec842ff86f2

    SHA1

    a201a73ca0b982c107dee09fe02f8b795794cfff

    SHA256

    b411bd5d0af45843895aca813e576307fa08168f838a7d1e49c2043beac63c82

    SHA512

    28aa04769a0001ce0015fe6fe98f0217eb89ded71001d2c50f837cad5aba1a9e689b6d12c27a0fb2da09bdc41a1b12a97945d10466e1d854d88a20e410a99875

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

    Filesize

    18KB

    MD5

    93278ec23754b587aac5c01e4b7f43ad

    SHA1

    ea8e12b77290581fb68880ea39e3c391288771c0

    SHA256

    b444a51d32d0daefbcac5aa5d58b2ece3dfd96eab515e12e2c388dff5419ea3f

    SHA512

    b442ef54be7b98ab6be78a4ad49dcfcbabc1dab2b55095c12ec3a32511a02fd81202424626cd79506fd215094dae41061612ee235423919c6e693f361be1b462

  • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_g2zpjqtj.cf2.ps1

    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

  • memory/536-110-0x0000000006810000-0x0000000006832000-memory.dmp

    Filesize

    136KB

  • memory/536-109-0x0000000006470000-0x00000000064BC000-memory.dmp

    Filesize

    304KB

  • memory/536-107-0x0000000005BC0000-0x0000000005F14000-memory.dmp

    Filesize

    3.3MB

  • memory/2392-50-0x0000000006DC0000-0x0000000006DDE000-memory.dmp

    Filesize

    120KB

  • memory/2392-56-0x00000000071F0000-0x0000000007286000-memory.dmp

    Filesize

    600KB

  • memory/2392-64-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2392-61-0x0000000007290000-0x0000000007298000-memory.dmp

    Filesize

    32KB

  • memory/2392-60-0x00000000072B0000-0x00000000072CA000-memory.dmp

    Filesize

    104KB

  • memory/2392-15-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2392-14-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2392-12-0x0000000002340000-0x0000000002376000-memory.dmp

    Filesize

    216KB

  • memory/2392-18-0x0000000004E80000-0x00000000054A8000-memory.dmp

    Filesize

    6.2MB

  • memory/2392-19-0x0000000004B80000-0x0000000004BA2000-memory.dmp

    Filesize

    136KB

  • memory/2392-21-0x0000000005600000-0x0000000005666000-memory.dmp

    Filesize

    408KB

  • memory/2392-20-0x0000000005520000-0x0000000005586000-memory.dmp

    Filesize

    408KB

  • memory/2392-22-0x0000000005670000-0x00000000059C4000-memory.dmp

    Filesize

    3.3MB

  • memory/2392-59-0x00000000071B0000-0x00000000071C4000-memory.dmp

    Filesize

    80KB

  • memory/2392-32-0x0000000005C50000-0x0000000005C6E000-memory.dmp

    Filesize

    120KB

  • memory/2392-33-0x0000000005C70000-0x0000000005CBC000-memory.dmp

    Filesize

    304KB

  • memory/2392-58-0x00000000071A0000-0x00000000071AE000-memory.dmp

    Filesize

    56KB

  • memory/2392-57-0x0000000007170000-0x0000000007181000-memory.dmp

    Filesize

    68KB

  • memory/2392-37-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2392-55-0x0000000006FE0000-0x0000000006FEA000-memory.dmp

    Filesize

    40KB

  • memory/2392-38-0x0000000006E00000-0x0000000006E32000-memory.dmp

    Filesize

    200KB

  • memory/2392-39-0x0000000070060000-0x00000000700AC000-memory.dmp

    Filesize

    304KB

  • memory/2392-54-0x0000000006F70000-0x0000000006F8A000-memory.dmp

    Filesize

    104KB

  • memory/2392-51-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2392-53-0x00000000075C0000-0x0000000007C3A000-memory.dmp

    Filesize

    6.5MB

  • memory/2392-52-0x0000000006E40000-0x0000000006EE3000-memory.dmp

    Filesize

    652KB

  • memory/2904-4-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2904-150-0x0000000000400000-0x0000000000D50000-memory.dmp

    Filesize

    9.3MB

  • memory/2904-82-0x0000000006EA0000-0x0000000006F16000-memory.dmp

    Filesize

    472KB

  • memory/2904-11-0x0000000005430000-0x00000000059D4000-memory.dmp

    Filesize

    5.6MB

  • memory/2904-35-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2904-34-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2904-10-0x0000000003230000-0x00000000032C2000-memory.dmp

    Filesize

    584KB

  • memory/2904-16-0x0000000076B40000-0x0000000076B41000-memory.dmp

    Filesize

    4KB

  • memory/2904-17-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2904-13-0x0000000000400000-0x0000000000D50000-memory.dmp

    Filesize

    9.3MB

  • memory/2904-149-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2904-9-0x0000000000400000-0x0000000000D50000-memory.dmp

    Filesize

    9.3MB

  • memory/2904-1-0x0000000076B40000-0x0000000076B41000-memory.dmp

    Filesize

    4KB

  • memory/2904-8-0x0000000000400000-0x0000000000D50000-memory.dmp

    Filesize

    9.3MB

  • memory/2904-36-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2904-83-0x00000000070B0000-0x0000000007100000-memory.dmp

    Filesize

    320KB

  • memory/2904-49-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2904-85-0x0000000007120000-0x000000000713E000-memory.dmp

    Filesize

    120KB

  • memory/2904-6-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2904-2-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2904-3-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2904-0-0x0000000000400000-0x0000000000D50000-memory.dmp

    Filesize

    9.3MB

  • memory/2904-126-0x0000000007300000-0x0000000007312000-memory.dmp

    Filesize

    72KB

  • memory/2904-5-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2904-125-0x00000000072F0000-0x00000000072FA000-memory.dmp

    Filesize

    40KB

  • memory/2944-76-0x0000000006380000-0x00000000066D4000-memory.dmp

    Filesize

    3.3MB

  • memory/2944-66-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/2944-79-0x0000000076B20000-0x0000000076C10000-memory.dmp

    Filesize

    960KB

  • memory/3212-121-0x0000000006120000-0x0000000006474000-memory.dmp

    Filesize

    3.3MB

  • memory/3712-138-0x0000000005FE0000-0x0000000006334000-memory.dmp

    Filesize

    3.3MB

  • memory/3712-140-0x00000000066B0000-0x00000000066FC000-memory.dmp

    Filesize

    304KB