Malicious Office (OLE) / .DOC — malware analysis report

Static analysis result for SHA-256 144c4169fba54d84…

MALICIOUS

Office (OLE) / .DOC

382.5 KB Created: 2020-12-10 10:21:00 Authoring application: Microsoft Office Word
MD5: de9538b9867e559105756da43f5c2ad2 SHA-1: d9d9bb750689fa95e6d0f17586ed7bdd1b965a85 SHA-256: 144c4169fba54d84b6f8b73bae6d28473b7e7cd09b3d032343cd79e01878549b
682 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 Visual Basic

The sample is a malicious Microsoft Word document that exploits CVE-2007-3899 to achieve code execution. It contains a VBA macro that uses the ShellExecute API to run an embedded PE executable. The macro also attempts to construct a command using string concatenation, likely to execute a payload or establish persistence. The embedded executable was detected as a keylogger by ClamAV.

Heuristics 17

  • CVE-2007-3899 — Microsoft Word malformed string memory corruption critical CVE likely CVE_2007_3899
    Word OLE document has the MS07-060 malformed-string exploit shape: a Word 97-family FIB points to a malformed DOP/string-table region with an abnormal INT_MAX run, inflated text counters, and exploit payload or Mdropper.Z campaign evidence.
  • OLE with Ole10Native — possible CVE-2026-21514 exploitation high CVE likely CVE_2026_21514
    Document contains a Word OLE object with Ole10Native plus executable, PE, or risky remote-link indicators. CVE-2026-21514 exploits OLE metadata validation; this stronger structure is treated as likely exploitation.
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Embedded PE executable critical OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • ClamAV: Doc.Dropper.Hancitor-9845854-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Hancitor-9845854-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API
  • Reference to VirtualProtect API medium SC_STR_VIRTUALPROTECT
    Reference to VirtualProtect API
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
81aef8b4598bb7c446cd2ebacfb1c041e0a50b81ca3504e4b043dac22873d9e2		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3676 bytes
embedded_office_00021a71.exe
c5b4adbd7652d61911b2a4524ccf3d1af2ba14c1d6f590d70d5bbe28ec8dea20		 embedded-pe Office MZ+PE at offset 0x21A71 253839 bytes
Detection
ClamAV: Win.Keylogger.Zusy-9807586-0
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
ole10native_00.bin
dcd54086be6abb555b8fe505205c3d424069f715a43726471a3a8c6399799c31		 ole-package OLE Ole10Native stream: ObjectPool/_1669079229/Ole10Native 215861 bytes
Detection
ClamAV: Win.Keylogger.Zusy-9807586-0
Obfuscation or payload: unlikely

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