Office (OLE) / .DOC malware analysis — malicious · 81fba1bcfe739de4

MALICIOUS

Office (OLE) / .DOC

1.85 MB First seen: 2022-09-12

MD5: 9d485388d7f9c62b7ca8097ffb8a6c9e SHA-1: 39d108fb434f66f029403e06cd105e06e27223d9 SHA-256: 81fba1bcfe739de41cb3837b880f906c6319198e96ef530ca114e326beb67b89

142 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model T1204.001 Malicious Link

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This, combined with the presence of an OLE object, strongly suggests the document is designed to exploit this vulnerability to execute a secondary payload. The extracted artifact 'ole10native_00.bin' is the likely payload container.

Heuristics 4

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.
x86 GetPC stub (CALL $+5; POP EAX) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP EAX)
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` `0514749484bc4b38e00f1933bda455719764cc833b54027c3b91bfb2d8cc1bdb`	ole-package	OLE Ole10Native stream: Ole10nAtiVe	1918661 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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