Office (OLE) malware analysis — malicious · 24016266b7c64e45

MALICIOUS

Office (OLE)

509.0 KB Created: 2017-12-15 12:46:00 Authoring application: Microsoft Office Word First seen: 2017-12-24

MD5: 5f03a6d1bbe41fb3ceaa4afaf9f3a93c SHA-1: 7ef325f91d9eb1f6fcc56ac63fffeb9fe50d4caa SHA-256: 24016266b7c64e457dca89c24618e38b508a8bc18ac4998d44a94636af972213

502 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information T1027 Obfuscated Files or Information T1203 Exploitation for Client Execution

The sample is a Microsoft Word document that exploits CVE-2007-3899 to drop a PE executable. The document body suggests it is a password-protected archive lure, which is a common tactic to bypass gateway scanning. The embedded executable, detected by ClamAV as Win.Exploit.Bypassuac-9883294-0, is the primary payload.

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_00003c97.exe`	embedded-pe	Office MZ+PE at offset 0x3C97	505705 bytes
SHA-256: `de6062a52cebb393e07eb85073b7d9a3658c24ab4a88f34fd7e041911b9dcf00`
Detection ClamAV: Win.Exploit.Bypassuac-9883294-0 Obfuscation or payload: likely Carved artifact entropy is 7.82, consistent with packed or encrypted content.
`ole10native_00.bin`	ole-package	OLE Ole10Native stream: ObjectPool/_1574850757/Ole10Native	501250 bytes
SHA-256: `260598afe3538e9f6038156c3127bc78ca262313c5629fe00b278288576aed83`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.85, consistent with packed or encrypted content.

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