Analysis

  • max time kernel
    100s
  • max time network
    157s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    01-06-2022 16:01

General

  • Target

    asdf.exe

  • Size

    1.1MB

  • MD5

    c3f533c47a2f995cd4b5d16653698609

  • SHA1

    223cfb523ff8b64b339a34db3808dc6a386752a4

  • SHA256

    672fea64c92edc4d937d3132577b65813738bfddeab6a6b3ef35e6fa4b987009

  • SHA512

    6f6635c7864f675f0f9dfe315c5a7aeef93da7ca91b6016eed8506b7e1c809de8031f9659f87339f58e807a6d59b83214896af5ba71659b0b9e50511a1c91761

Malware Config

Extracted

Family

arkei

Botnet

Default

Signatures

  • Arkei

    Arkei is an infostealer written in C++.

  • suricata: ET MALWARE Base64 Encoded Stealer Config from Server - APPDATA or USERPROFILE Environment Variable M4

    suricata: ET MALWARE Base64 Encoded Stealer Config from Server - APPDATA or USERPROFILE Environment Variable M4

  • suricata: ET MALWARE Win32/Vidar Variant/Mars Stealer CnC Exfil

    suricata: ET MALWARE Win32/Vidar Variant/Mars Stealer CnC Exfil

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 5 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Checks installed software on the system 1 TTPs

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

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

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

  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • Delays execution with timeout.exe 1 IoCs
  • Suspicious behavior: MapViewOfSection 2 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 22 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\asdf.exe
    "C:\Users\Admin\AppData\Local\Temp\asdf.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of SetThreadContext
    • Suspicious behavior: MapViewOfSection
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:1584
    • C:\Users\Admin\AppData\Local\Temp\dhgerme.exe
      "C:\Users\Admin\AppData\Local\Temp\dhgerme.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious use of SetThreadContext
      • Suspicious behavior: MapViewOfSection
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1540
      • C:\Users\Admin\AppData\Local\Temp\dhgerme.exe
        "C:\Users\Admin\AppData\Local\Temp\dhgerme.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Checks processor information in registry
        • Suspicious use of WriteProcessMemory
        PID:1844
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\dhgerme.exe" & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:1048
          • C:\Windows\SysWOW64\timeout.exe
            timeout /t 5
            5⤵
            • Delays execution with timeout.exe
            PID:1752
    • C:\Users\Admin\AppData\Local\Temp\asdf.exe
      "C:\Users\Admin\AppData\Local\Temp\asdf.exe"
      2⤵
        PID:1356

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Credential Access

    Credentials in Files

    2
    T1081

    Discovery

    Query Registry

    2
    T1012

    System Information Discovery

    2
    T1082

    Collection

    Data from Local System

    2
    T1005

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\dhgerme.exe
      Filesize

      636KB

      MD5

      3db09f87da90c69511e1e8b27adac692

      SHA1

      f07109e4e9e46467022d45cf12c79f4ead85e0b6

      SHA256

      e7d98b927978c0b948f863f504a1a0e950c7261e895edb0332aedcdcf40b7132

      SHA512

      d301617a3f4c54e4698714243f8701ae462d5178c607f2550e03eb8f50be749c6c74a43037fb29a58e9b5853154c558f0884d74176f999bbe22518156055040a

    • C:\Users\Admin\AppData\Local\Temp\dhgerme.exe
      Filesize

      636KB

      MD5

      3db09f87da90c69511e1e8b27adac692

      SHA1

      f07109e4e9e46467022d45cf12c79f4ead85e0b6

      SHA256

      e7d98b927978c0b948f863f504a1a0e950c7261e895edb0332aedcdcf40b7132

      SHA512

      d301617a3f4c54e4698714243f8701ae462d5178c607f2550e03eb8f50be749c6c74a43037fb29a58e9b5853154c558f0884d74176f999bbe22518156055040a

    • C:\Users\Admin\AppData\Local\Temp\dhgerme.exe
      Filesize

      636KB

      MD5

      3db09f87da90c69511e1e8b27adac692

      SHA1

      f07109e4e9e46467022d45cf12c79f4ead85e0b6

      SHA256

      e7d98b927978c0b948f863f504a1a0e950c7261e895edb0332aedcdcf40b7132

      SHA512

      d301617a3f4c54e4698714243f8701ae462d5178c607f2550e03eb8f50be749c6c74a43037fb29a58e9b5853154c558f0884d74176f999bbe22518156055040a

    • \ProgramData\mozglue.dll
      Filesize

      133KB

      MD5

      8f73c08a9660691143661bf7332c3c27

      SHA1

      37fa65dd737c50fda710fdbde89e51374d0c204a

      SHA256

      3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

      SHA512

      0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

    • \ProgramData\nss3.dll
      Filesize

      1.2MB

      MD5

      bfac4e3c5908856ba17d41edcd455a51

      SHA1

      8eec7e888767aa9e4cca8ff246eb2aacb9170428

      SHA256

      e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

      SHA512

      2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

    • \Users\Admin\AppData\Local\Temp\dhgerme.exe
      Filesize

      636KB

      MD5

      3db09f87da90c69511e1e8b27adac692

      SHA1

      f07109e4e9e46467022d45cf12c79f4ead85e0b6

      SHA256

      e7d98b927978c0b948f863f504a1a0e950c7261e895edb0332aedcdcf40b7132

      SHA512

      d301617a3f4c54e4698714243f8701ae462d5178c607f2550e03eb8f50be749c6c74a43037fb29a58e9b5853154c558f0884d74176f999bbe22518156055040a

    • \Users\Admin\AppData\Local\Temp\dhgerme.exe
      Filesize

      636KB

      MD5

      3db09f87da90c69511e1e8b27adac692

      SHA1

      f07109e4e9e46467022d45cf12c79f4ead85e0b6

      SHA256

      e7d98b927978c0b948f863f504a1a0e950c7261e895edb0332aedcdcf40b7132

      SHA512

      d301617a3f4c54e4698714243f8701ae462d5178c607f2550e03eb8f50be749c6c74a43037fb29a58e9b5853154c558f0884d74176f999bbe22518156055040a

    • \Users\Admin\AppData\Local\Temp\dhgerme.exe
      Filesize

      636KB

      MD5

      3db09f87da90c69511e1e8b27adac692

      SHA1

      f07109e4e9e46467022d45cf12c79f4ead85e0b6

      SHA256

      e7d98b927978c0b948f863f504a1a0e950c7261e895edb0332aedcdcf40b7132

      SHA512

      d301617a3f4c54e4698714243f8701ae462d5178c607f2550e03eb8f50be749c6c74a43037fb29a58e9b5853154c558f0884d74176f999bbe22518156055040a

    • memory/1048-97-0x0000000000000000-mapping.dmp
    • memory/1356-64-0x0000000000407486-mapping.dmp
    • memory/1356-75-0x0000000000400000-0x0000000000412000-memory.dmp
      Filesize

      72KB

    • memory/1356-72-0x0000000000400000-0x0000000000412000-memory.dmp
      Filesize

      72KB

    • memory/1540-59-0x0000000000000000-mapping.dmp
    • memory/1584-68-0x00000000003F0000-0x00000000003F7000-memory.dmp
      Filesize

      28KB

    • memory/1584-56-0x0000000074F91000-0x0000000074F93000-memory.dmp
      Filesize

      8KB

    • memory/1752-99-0x0000000000000000-mapping.dmp
    • memory/1844-73-0x0000000000400000-0x000000000043D000-memory.dmp
      Filesize

      244KB

    • memory/1844-76-0x0000000060900000-0x0000000060992000-memory.dmp
      Filesize

      584KB

    • memory/1844-70-0x0000000000400000-0x000000000043D000-memory.dmp
      Filesize

      244KB

    • memory/1844-98-0x0000000000400000-0x000000000043D000-memory.dmp
      Filesize

      244KB

    • memory/1844-67-0x000000000043C0B2-mapping.dmp