Analysis

  • max time kernel
    297s
  • max time network
    196s
  • platform
    windows7_x64
  • resource
    win7-20230703-en
  • resource tags

    arch:x64arch:x86image:win7-20230703-enlocale:en-usos:windows7-x64system
  • submitted
    12/07/2023, 10:04

General

  • Target

    pdf.exe

  • Size

    357KB

  • MD5

    8a2b59ddaa578f5f6b37af39a0bb9aab

  • SHA1

    52a0a411c1e53c0f082515fb551d20f9dd9b51a1

  • SHA256

    dcd849401b6834b4c36006567cbf2e9bcc2093849432a104ff43d178867d397d

  • SHA512

    0e5de1a81c045b9dc1265ffa14c84781976a49fb569858646c3101c92721a535e0d8136b8b973fbfb8a6be043c029cbcff87bbe9079ced202b31368764858ec4

  • SSDEEP

    6144:1spNjls8PZVheNA+ff0CpelHQi+lhlSECXIm8feVrAKt:1c9nhe2evpelHQXhNC4N7Kt

Malware Config

Signatures

  • Guloader,Cloudeye

    A shellcode based downloader first seen in 2020.

  • Checks QEMU agent file 2 TTPs 2 IoCs

    Checks presence of QEMU agent, possibly to detect virtualization.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Loads dropped DLL 1 IoCs
  • Checks installed software on the system 1 TTPs

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

  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Drops file in System32 directory 1 IoCs
  • Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Drops file in Program Files directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: EnumeratesProcesses 50 IoCs
  • Suspicious behavior: MapViewOfSection 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\pdf.exe
    "C:\Users\Admin\AppData\Local\Temp\pdf.exe"
    1⤵
    • Checks QEMU agent file
    • Loads dropped DLL
    • Drops file in System32 directory
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Suspicious use of SetThreadContext
    • Drops file in Program Files directory
    • Suspicious behavior: MapViewOfSection
    • Suspicious use of WriteProcessMemory
    PID:1496
    • C:\Users\Admin\AppData\Local\Temp\pdf.exe
      "C:\Users\Admin\AppData\Local\Temp\pdf.exe"
      2⤵
      • Checks QEMU agent file
      • Checks computer location settings
      • Suspicious use of NtCreateThreadExHideFromDebugger
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious use of SetThreadContext
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: MapViewOfSection
      • Suspicious use of AdjustPrivilegeToken
      PID:2268
    • C:\Windows\SysWOW64\cscript.exe
      "C:\Windows\SysWOW64\cscript.exe"
      2⤵
        PID:896

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • \Users\Admin\AppData\Local\Temp\nst3B7C.tmp\System.dll

            Filesize

            11KB

            MD5

            17ed1c86bd67e78ade4712be48a7d2bd

            SHA1

            1cc9fe86d6d6030b4dae45ecddce5907991c01a0

            SHA256

            bd046e6497b304e4ea4ab102cab2b1f94ce09bde0eebba4c59942a732679e4eb

            SHA512

            0cbed521e7d6d1f85977b3f7d3ca7ac34e1b5495b69fd8c7bfa1a846baf53b0ecd06fe1ad02a3599082ffacaf8c71a3bb4e32dec05f8e24859d736b828092cd5

          • memory/1496-63-0x0000000002760000-0x0000000003E6D000-memory.dmp

            Filesize

            23.1MB

          • memory/1496-64-0x0000000002760000-0x0000000003E6D000-memory.dmp

            Filesize

            23.1MB

          • memory/1496-91-0x0000000003F70000-0x0000000004040000-memory.dmp

            Filesize

            832KB

          • memory/2268-65-0x0000000000400000-0x0000000001462000-memory.dmp

            Filesize

            16.4MB

          • memory/2268-66-0x0000000001470000-0x0000000002B7D000-memory.dmp

            Filesize

            23.1MB

          • memory/2268-67-0x0000000000400000-0x0000000001462000-memory.dmp

            Filesize

            16.4MB

          • memory/2268-88-0x0000000000400000-0x0000000001462000-memory.dmp

            Filesize

            16.4MB

          • memory/2268-89-0x0000000001470000-0x0000000002B7D000-memory.dmp

            Filesize

            23.1MB

          • memory/2268-92-0x0000000001470000-0x0000000002B7D000-memory.dmp

            Filesize

            23.1MB

          • memory/2268-93-0x0000000033050000-0x0000000033353000-memory.dmp

            Filesize

            3.0MB

          • memory/2268-94-0x0000000000400000-0x0000000001462000-memory.dmp

            Filesize

            16.4MB