Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 04b91c6a305e1681…

MALICIOUS

Office (OLE)

901.0 KB Created: 2021-07-06 12:07:00 Authoring application: Microsoft Office Word
MD5: a481099f7fdfc7fc4a346456888755da SHA-1: ce28f531f7f206a0752d33239086664f8985cb30 SHA-256: 04b91c6a305e16819b1a177a5a2d68888c8eb1949ebc2622931e9f6618c4c767
642 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 Visual Basic T1059 Command and Scripting Interpreter

The sample exploits CVE-2007-3899, a memory corruption vulnerability in Microsoft Word, to achieve code execution. It contains a VBA macro that executes a second-stage payload, identified as an embedded PE executable. The macro attempts to download and execute a DLL named 'niberius.dll' using 'rundll32.exe'. The presence of CreateProcess, ShellExecute, LoadLibrary, and GetProcAddress API calls further indicates malicious execution capabilities.

Heuristics 16

  • 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.
  • Office EPRINT stream contains EMF object high CVE related OLE_EPRINT_EMF_OBJECT
    OLE ObjectPool contains an EPRINT stream with EMF data. This is rare in normal documents and is CVE-2007-3893/MS07-046-family evidence when paired with Office exploit payload anomalies, but the malformed EMF record is not proven by this rule alone.
  • 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.
  • Embedded PE executable critical OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • ClamAV: Win.Trojan.Generic-9876346-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Generic-9876346-0
  • 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 CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess API
  • 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
  • Ole10Native package carries executable/script file type high OFFICE_PACKAGE_RISKY_FILE
    OLE Package displayName or fullPath ends in an executable or script-capable extension. Even without UI extension spoofing, embedding a runnable payload inside an Office document is a high-risk delivery pattern.
  • 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.
  • 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
e71d307f9d10461ac01ffd83b84bd3b183b6ceb16528afc94404f1086c39a1ab		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2990 bytes
embedded_office_0008ec71.exe
c1b2d36f7da8638834bb016f8ab802cc1819219bd19b07aae7625cf64872c94a		 embedded-pe Office MZ+PE at offset 0x8EC71 337807 bytes
Detection
ClamAV: Win.Trojan.Injectorx-9876306-0
Obfuscation or payload: unlikely
ole10native_00.bin
7a93d6f3beaa6e6ecd2ef42f82c9112e8a857c08d7442f0d23d9ffe367084d8d		 ole-package OLE Ole10Native stream: ObjectPool/_1687053386/Ole10Native 298805 bytes
Detection
ClamAV: Win.Trojan.Generic-9876346-0
Obfuscation or payload: unlikely

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