Office (OLE) / .DOC malware analysis — malicious · c8b9a92abcbd2529

MALICIOUS

Office (OLE) / .DOC

4.41 MB First seen: 2022-07-31

MD5: 170301e806a34158c17b87632e26198b SHA-1: 278810a6eeac6708ce34af5648d4b27489d1c205 SHA-256: c8b9a92abcbd2529e442536a6799bdcc3fd12d401fa4e24514501054924f68ea

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is a Microsoft Word document containing an embedded Equation Editor object. Static analysis detected the presence of a payload associated with CVE-2017-11882 within this object. This indicates the document is designed to exploit this known vulnerability upon opening to execute a malicious payload. No specific family could be identified, but the exploit vector is clear.

Heuristics 3

Equation Editor Ole10Native payload — CVE-2017-11882 critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE

An embedded Microsoft Equation 3.0 object (CLSID 0002CE02-0000-0000-C000-000000000046) carries an Ole10Native packager stream instead of the normal Equation Native/MTEF data. This is the weaponized Equation Editor RCE delivery shape used by CVE-2017-11882 / CVE-2018-0802 maldocs. The payload (font-record overflow + shellcode) is frequently encrypted and the stream name case-scrambled to evade scanners, but an Equation object holding an Ole10Native stream has no benign use.
Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Contains Equation Editor object — related to CVE-2017-11882 / CVE-2018-0802 exploitation, but CLSID presence alone is not the malformed MTEF exploit primitive.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ole10native_00.bin` `a521f84c7608ece3838644c6f168c9c3d677db13a58194cc6941c313a5f5b0a5`	ole-package	OLE Ole10Native stream: Ole10Native	4584061 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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