Office (OLE) malware analysis — malicious · 4b3d70fdb6909f84

MALICIOUS

Office (OLE)

749.0 KB Created: 2018-02-22 16:02:00 Authoring application: Microsoft Office Word First seen: 2018-03-04

MD5: 89c0235024d981f063e7730345c3bb83 SHA-1: 736cf6acda674e989e6554fbc3120b74db93953c SHA-256: 4b3d70fdb6909f84c8aeb17273926a68e2bc7b50a85cd9ecfd7a036253a1079d

502 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a Microsoft Word document containing an embedded executable file, identified by the 'OLE_EMBEDDED_EXE' and 'OFFICE_PACKAGE_RISKY_FILE' heuristics. It exploits CVE-2007-3899, a memory corruption vulnerability in Microsoft Word, to achieve code execution. The embedded executable is likely a secondary payload, and the document's text about converting file formats is a lure to mask the malicious activity.

Heuristics 10

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: Win.Exploit.Bypassuac-9883294-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Exploit.Bypassuac-9883294-0
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
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_office_0000da6a.exe`	embedded-pe	Office MZ+PE at offset 0xDA6A	711062 bytes
SHA-256: `ed435403a29941974b036842b784391422b8e480c9450fbe91ec449e8bcb1375`
Detection ClamAV: Win.Exploit.Bypassuac-9883294-0 Obfuscation or payload: likely Carved artifact entropy is 7.86, consistent with packed or encrypted content.
`ole10native_00.bin`	ole-package	OLE Ole10Native stream: ObjectPool/_1580824120/Ole10Native	705611 bytes
SHA-256: `fcc5114038926a8fa2fc0e0754c65caa75d0099f473c2b960f1f9fe552403048`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.86, consistent with packed or encrypted content.

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