Office (OLE) malware analysis — malicious · 17571a1fcf8c28b2

MALICIOUS

Office (OLE)

875.5 KB Created: 2014-12-01 23:31:00 Authoring application: Microsoft Office Word First seen: 2018-06-21

MD5: 90a75836352c7662cb63dbc566f8e2de SHA-1: eed1239cfedc12c5cacb6ac5a5dda9a059859529 SHA-256: 17571a1fcf8c28b2b61ed0048294e73b9801a13ac4987f82ef68198e570a1aae

444 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

The file is identified as malicious by ClamAV and exhibits critical heuristic firings indicating it's a dropper for an embedded executable. The presence of ShellExecute, VirtualAlloc, VirtualProtect, LoadLibrary, and GetProcAddress API calls, along with the CVE-2007-3899 exploit, suggests the document is designed to drop and execute a secondary payload. The embedded PE executable and Ole10Native package further confirm its role as a dropper.

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-6519262-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6519262-0
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 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
Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC

Reference to VirtualAlloc API
Reference to VirtualProtect API medium SC_STR_VIRTUALPROTECT

Reference to VirtualProtect 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_00004e74.exe`	embedded-pe	Office MZ+PE at offset 0x4E74	876428 bytes
SHA-256: `ad3da3a97411c6cd3c0c203e56fab24734903c5fd62790965e50b33a129fe32f`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.90, consistent with packed or encrypted content.
`ole10native_00.bin`	ole-package	OLE Ole10Native stream: ObjectPool/_1484025332/Ole10Native	852798 bytes
SHA-256: `d52037ceb9a14cc0cab061a989b4b721c020daba1707e9554173a1a8d02cf0d8`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.90, consistent with packed or encrypted content.

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