Office (OLE) malware analysis — malicious · 349a62f070e7aec9

MALICIOUS

Office (OLE)

713.0 KB Created: 2003-04-12 07:56:00 Authoring application: Microsoft Office Word First seen: 2019-04-18

MD5: 162922746c79e15bed86095e27dc6575 SHA-1: 8697679b087d968f5fd2e46ca5e7bc1e062b9748 SHA-256: 349a62f070e7aec909914a773d0828f476da9d0b3221412affb1b6e8f5f910ec

464 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information T1105 Ingress Tool Transfer

The file is a Microsoft Office document containing an embedded PE executable, identified by the OLE_EMBEDDED_EXE heuristic. The presence of CVE_2007_3899 and Ole10Native firings suggests exploitation of known vulnerabilities to facilitate the dropping of this executable. The embedded executable is likely a second-stage payload, and the document itself acts as a lure for initial delivery via spearphishing.

Heuristics 12

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.
ClamAV: Doc.Dropper.Agent-6591805-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6591805-0
Embedded PE executable critical OLE_EMBEDDED_EXE

MZ/PE header found inside document — possible embedded executable
Ole10Native package drops an auto-executable payload critical OFFICE_PACKAGE_RISKY_FILE

OLE Package displayName or fullPath ends in a directly auto-executable extension (a runnable binary or a script the default shell host runs on double-click). Embedding such a payload inside an Office document has no benign authoring use — it is a malware-delivery dropper.
Reference to WinExec API high SC_STR_WINEXEC

Reference to WinExec API
Reference to CreateProcess API high SC_STR_CREATEPROCESS

Reference to CreateProcess 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
Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC

Reference to VirtualAlloc API
Suspicious extracted artifact info 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.
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 In document text (OLE body)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_office_00004274.exe`	embedded-pe	Office MZ+PE at offset 0x4274	713100 bytes
SHA-256: `36a9922d8a5577aa8c07e438e56d077aab6bad4c2c7c1c384c4a558d9f0b9454`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.80, consistent with packed or encrypted content.
`ole10native_00.bin`	ole-package	OLE Ole10Native stream: ObjectPool/_1548068746/Ole10Native	704156 bytes
SHA-256: `21419581410af2e5d15edcc2eba19cef2f7d3e80af574f10092d23fb2c08fc59`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.80, consistent with packed or encrypted content.

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