Analysis

  • max time kernel
    142s
  • max time network
    120s
  • platform
    windows7_x64
  • resource
    win7-en-20211104
  • submitted
    09-11-2021 02:28

General

  • Target

    35ff5f54ce6916b53bddc3b3d4acb854.exe

  • Size

    3.3MB

  • MD5

    35ff5f54ce6916b53bddc3b3d4acb854

  • SHA1

    f90ecfdef0c315285a43ee6f14717679916453cc

  • SHA256

    878ae0892199581e106ef623d98801cab28341b1b969eaeff6a3704c580dce76

  • SHA512

    a79a316ce197ccab1f9090436195557420f833ecb2bb84e1f15ab60beb0d2bd0c3d9b013b22c38ba3f53d3c430ae0295c842c2ca288cfbda3514d0acfc24fec3

Malware Config

Signatures

  • AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers.

  • suricata: ET MALWARE Single char EXE direct download likely trojan (multiple families)

    suricata: ET MALWARE Single char EXE direct download likely trojan (multiple families)

  • Async RAT payload 2 IoCs
  • Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
  • Downloads MZ/PE file
  • Executes dropped EXE 3 IoCs
  • Modifies Installed Components in the registry 2 TTPs
  • Checks BIOS information in registry 2 TTPs 2 IoCs

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

  • Loads dropped DLL 3 IoCs
  • Obfuscated with Agile.Net obfuscator 1 IoCs

    Detects use of the Agile.Net commercial obfuscator, which is capable of entity renaming and control flow obfuscation.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Themida packer 1 IoCs

    Detects Themida, an advanced Windows software protection system.

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Checks whether UAC is enabled 1 TTPs 1 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 5 IoCs
  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious use of AdjustPrivilegeToken 18 IoCs
  • Suspicious use of FindShellTrayWindow 24 IoCs
  • Suspicious use of SendNotifyMessage 25 IoCs
  • Suspicious use of WriteProcessMemory 39 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\35ff5f54ce6916b53bddc3b3d4acb854.exe
    "C:\Users\Admin\AppData\Local\Temp\35ff5f54ce6916b53bddc3b3d4acb854.exe"
    1⤵
    • Checks BIOS information in registry
    • Loads dropped DLL
    • Checks whether UAC is enabled
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1592
    • C:\Users\Admin\AppData\Local\Temp\1.exe
      "C:\Users\Admin\AppData\Local\Temp\1.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1748
      • C:\Windows\SysWOW64\cmd.exe
        "cmd.exe" /c REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /f /v "rtcupdater" /t REG_SZ /d "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\Root\rtcupdater.exe"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1772
        • C:\Windows\SysWOW64\reg.exe
          REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /f /v "rtcupdater" /t REG_SZ /d "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\Root\rtcupdater.exe"
          4⤵
          • Adds Run key to start application
          PID:328
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\Root\rtcupdater.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\Root\rtcupdater.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Suspicious use of SetThreadContext
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:940
        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\Root\rtcupdater.exe
          "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\Root\rtcupdater.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1616
          • C:\Windows\explorer.exe
            "C:\Windows\explorer.exe"
            5⤵
            • Modifies registry class
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of FindShellTrayWindow
            • Suspicious use of SendNotifyMessage
            • Suspicious use of WriteProcessMemory
            PID:1012
            • C:\Windows\system32\ctfmon.exe
              ctfmon.exe
              6⤵
                PID:2024
    • C:\Windows\system32\AUDIODG.EXE
      C:\Windows\system32\AUDIODG.EXE 0x510
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:856

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Persistence

    Registry Run Keys / Startup Folder

    2
    T1060

    Defense Evasion

    Virtualization/Sandbox Evasion

    1
    T1497

    Modify Registry

    2
    T1112

    Credential Access

    Credentials in Files

    2
    T1081

    Discovery

    Query Registry

    3
    T1012

    Virtualization/Sandbox Evasion

    1
    T1497

    System Information Discovery

    3
    T1082

    Collection

    Data from Local System

    2
    T1005

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\1.exe
      MD5

      93f2ef7ece667948d903fd81a9c93dae

      SHA1

      33a83a4a6d582c20c44719df67815455ec4f789c

      SHA256

      78b4ba3aaf358440be7212cb23b8ca6c3f4fef477436b52c483185d4b90a8dda

      SHA512

      793a9521600f50d127556ab7c46929faddc74e23cdbee49ec914a1502f346d7a3513036ee8d9c8d8c31112325217951b5e60df07093e5b6f3d0d3fc7148d2a4a

    • C:\Users\Admin\AppData\Local\Temp\1.exe
      MD5

      93f2ef7ece667948d903fd81a9c93dae

      SHA1

      33a83a4a6d582c20c44719df67815455ec4f789c

      SHA256

      78b4ba3aaf358440be7212cb23b8ca6c3f4fef477436b52c483185d4b90a8dda

      SHA512

      793a9521600f50d127556ab7c46929faddc74e23cdbee49ec914a1502f346d7a3513036ee8d9c8d8c31112325217951b5e60df07093e5b6f3d0d3fc7148d2a4a

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\Root\rtcupdater.exe
      MD5

      93f2ef7ece667948d903fd81a9c93dae

      SHA1

      33a83a4a6d582c20c44719df67815455ec4f789c

      SHA256

      78b4ba3aaf358440be7212cb23b8ca6c3f4fef477436b52c483185d4b90a8dda

      SHA512

      793a9521600f50d127556ab7c46929faddc74e23cdbee49ec914a1502f346d7a3513036ee8d9c8d8c31112325217951b5e60df07093e5b6f3d0d3fc7148d2a4a

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\Root\rtcupdater.exe
      MD5

      93f2ef7ece667948d903fd81a9c93dae

      SHA1

      33a83a4a6d582c20c44719df67815455ec4f789c

      SHA256

      78b4ba3aaf358440be7212cb23b8ca6c3f4fef477436b52c483185d4b90a8dda

      SHA512

      793a9521600f50d127556ab7c46929faddc74e23cdbee49ec914a1502f346d7a3513036ee8d9c8d8c31112325217951b5e60df07093e5b6f3d0d3fc7148d2a4a

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\Root\rtcupdater.exe
      MD5

      93f2ef7ece667948d903fd81a9c93dae

      SHA1

      33a83a4a6d582c20c44719df67815455ec4f789c

      SHA256

      78b4ba3aaf358440be7212cb23b8ca6c3f4fef477436b52c483185d4b90a8dda

      SHA512

      793a9521600f50d127556ab7c46929faddc74e23cdbee49ec914a1502f346d7a3513036ee8d9c8d8c31112325217951b5e60df07093e5b6f3d0d3fc7148d2a4a

    • \Users\Admin\AppData\Local\Temp\1.exe
      MD5

      93f2ef7ece667948d903fd81a9c93dae

      SHA1

      33a83a4a6d582c20c44719df67815455ec4f789c

      SHA256

      78b4ba3aaf358440be7212cb23b8ca6c3f4fef477436b52c483185d4b90a8dda

      SHA512

      793a9521600f50d127556ab7c46929faddc74e23cdbee49ec914a1502f346d7a3513036ee8d9c8d8c31112325217951b5e60df07093e5b6f3d0d3fc7148d2a4a

    • \Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\Root\rtcupdater.exe
      MD5

      93f2ef7ece667948d903fd81a9c93dae

      SHA1

      33a83a4a6d582c20c44719df67815455ec4f789c

      SHA256

      78b4ba3aaf358440be7212cb23b8ca6c3f4fef477436b52c483185d4b90a8dda

      SHA512

      793a9521600f50d127556ab7c46929faddc74e23cdbee49ec914a1502f346d7a3513036ee8d9c8d8c31112325217951b5e60df07093e5b6f3d0d3fc7148d2a4a

    • \Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\Root\rtcupdater.exe
      MD5

      93f2ef7ece667948d903fd81a9c93dae

      SHA1

      33a83a4a6d582c20c44719df67815455ec4f789c

      SHA256

      78b4ba3aaf358440be7212cb23b8ca6c3f4fef477436b52c483185d4b90a8dda

      SHA512

      793a9521600f50d127556ab7c46929faddc74e23cdbee49ec914a1502f346d7a3513036ee8d9c8d8c31112325217951b5e60df07093e5b6f3d0d3fc7148d2a4a

    • memory/328-71-0x0000000000000000-mapping.dmp
    • memory/940-82-0x0000000001040000-0x000000000104B000-memory.dmp
      Filesize

      44KB

    • memory/940-83-0x0000000001090000-0x0000000001091000-memory.dmp
      Filesize

      4KB

    • memory/940-74-0x0000000000000000-mapping.dmp
    • memory/940-77-0x0000000001140000-0x0000000001141000-memory.dmp
      Filesize

      4KB

    • memory/940-79-0x00000000048B0000-0x00000000048B1000-memory.dmp
      Filesize

      4KB

    • memory/940-81-0x00000000048B1000-0x00000000048B2000-memory.dmp
      Filesize

      4KB

    • memory/1012-102-0x0000000003D10000-0x0000000003D11000-memory.dmp
      Filesize

      4KB

    • memory/1012-100-0x000007FEFB761000-0x000007FEFB763000-memory.dmp
      Filesize

      8KB

    • memory/1012-99-0x0000000000000000-mapping.dmp
    • memory/1592-59-0x0000000000F60000-0x0000000000F61000-memory.dmp
      Filesize

      4KB

    • memory/1592-61-0x0000000004EC0000-0x0000000004EC1000-memory.dmp
      Filesize

      4KB

    • memory/1592-55-0x0000000074F01000-0x0000000074F03000-memory.dmp
      Filesize

      8KB

    • memory/1616-87-0x0000000000400000-0x0000000000437000-memory.dmp
      Filesize

      220KB

    • memory/1616-96-0x00000000010E1000-0x00000000010E2000-memory.dmp
      Filesize

      4KB

    • memory/1616-86-0x0000000000400000-0x0000000000437000-memory.dmp
      Filesize

      220KB

    • memory/1616-98-0x00000000010E3000-0x00000000010E4000-memory.dmp
      Filesize

      4KB

    • memory/1616-85-0x0000000000400000-0x0000000000437000-memory.dmp
      Filesize

      220KB

    • memory/1616-88-0x0000000000400000-0x0000000000437000-memory.dmp
      Filesize

      220KB

    • memory/1616-89-0x0000000000400000-0x0000000000437000-memory.dmp
      Filesize

      220KB

    • memory/1616-90-0x0000000000400000-0x0000000000437000-memory.dmp
      Filesize

      220KB

    • memory/1616-91-0x000000000040CD2F-mapping.dmp
    • memory/1616-95-0x0000000000400000-0x0000000000437000-memory.dmp
      Filesize

      220KB

    • memory/1616-93-0x0000000000AB0000-0x0000000000AD0000-memory.dmp
      Filesize

      128KB

    • memory/1616-94-0x0000000000AE0000-0x0000000000AFE000-memory.dmp
      Filesize

      120KB

    • memory/1616-97-0x00000000010E2000-0x00000000010E3000-memory.dmp
      Filesize

      4KB

    • memory/1748-63-0x0000000000000000-mapping.dmp
    • memory/1748-66-0x00000000001D0000-0x00000000001D1000-memory.dmp
      Filesize

      4KB

    • memory/1748-68-0x00000000048C0000-0x00000000048C1000-memory.dmp
      Filesize

      4KB

    • memory/1748-72-0x00000000048C1000-0x00000000048C2000-memory.dmp
      Filesize

      4KB

    • memory/1748-69-0x00000000041D0000-0x00000000041F1000-memory.dmp
      Filesize

      132KB

    • memory/1772-70-0x0000000000000000-mapping.dmp
    • memory/2024-101-0x0000000000000000-mapping.dmp