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

Static analysis result for SHA-256 678da85cecff2cdd…

MALICIOUS

Office (OLE) / .DOC

633.5 KB Created: 2021-01-13 15:00:00 Authoring application: Microsoft Office Word
MD5: 8cde22c011629e537c9f3ef15225c2d7 SHA-1: e85624f6fb796946b75d2091c3c38ed61764cde8 SHA-256: 678da85cecff2cdda8559281dfc8a89f87c44c6371cbda4de4bc9ea5cd2f5cf9
582 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.005 Visual Basic T1071.001 Web Protocols T1105 Ingress Tool Transfer T1203 Exploitation for Client Execution

The sample exploits CVE-2007-3899, a memory corruption vulnerability in Microsoft Word, to trigger a Document_Open VBA macro. This macro uses ShellExecute to run a command that appears to be related to registering a DLL, likely to download and execute a second-stage payload from the embedded PE executable. The ClamAV detection names 'Doc.Dropper.Hancitor-9845854-0' and 'Win.Dropper.PinkSbot-9853703-0' further indicate its dropper functionality.

Heuristics 14

  • 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
  • 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
  • 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
f4f6524f707c592691c94a71cb28e232f2ecfc89447c765d4169193ba44add5f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3947 bytes
embedded_office_00022275.exe
a050ff8462259df46795045e01b3768434c5dac855a8080aff7ae3357ef6448b		 embedded-pe Office MZ+PE at offset 0x22275 508811 bytes
Detection
ClamAV: Win.Dropper.PinkSbot-9853703-0
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
ole10native_00.bin
4392d301a7cdee06085246f349b9d8039521e359793f5d14a3e057c16ec59fe5		 ole-package OLE Ole10Native stream: ObjectPool/_1672026450/Ole10Native 470849 bytes

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