Office (OLE) malware analysis — malicious · f033771605dd01cf

MALICIOUS

Office (OLE)

748.5 KB Created: 2018-02-20 20:04:00 Authoring application: Microsoft Office Word First seen: 2018-03-04

MD5: a6a8422abddfe2a2ffa4b6607274ef4a SHA-1: 295ef26f83c76d43374d163df15679a818f978a0 SHA-256: f033771605dd01cfe0adbac3ac0fd683614afef1c06b6205f57c442cbdcda7d3

562 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a Microsoft Word document containing an embedded OLE package that drops a PE executable. Heuristics indicate exploitation of CVE-2007-3899 and the embedded executable is detected by ClamAV as Win.Exploit.Bypassuac-9883294-0. The document body suggests a conversion lure, which is a common tactic for social engineering users into executing malicious content.

Heuristics 11

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 payload is a download-and-execute script critical OFFICE_PACKAGE_SCRIPT_DROPPER

The OLE Package's embedded payload contains a script that hosts a shell (PowerShell/WScript/mshta), fetches a remote resource, and executes it — a download-and-run dropper. Embedding such a script inside an Office document via the Object Packager is a direct user-execution delivery technique (MITRE T1204.002), not a benign attachment.
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_0000da64.exe`	embedded-pe	Office MZ+PE at offset 0xDA64	710556 bytes
SHA-256: `fb3f10249429a1161c7f68980501d17de71ce1a813b719dc890e7f286f070232`
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/_1580665839/Ole10Native	705092 bytes
SHA-256: `d2f3555b91f0282946333105d5667225ebd1b605d56313798c022b7919c42d5a`
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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