Office (OLE) / .XLS malware analysis — malicious · 81cecc53677da5e4

MALICIOUS

Office (OLE) / .XLS

168.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-10-12

MD5: 99af4f6ffa5c05daf190c85c2109a6b8 SHA-1: 6a6e13b9f60f32213ff4f22bf159c245f563ed66 SHA-256: 81cecc53677da5e418f8e41bb7efd3c46e7ac6dd274a0c45eae5617fabb93fc9

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in the Equation Editor. This, combined with the OLE_EQUATION_EDITOR heuristic, strongly suggests the file is designed to exploit this vulnerability. The embedded OLE object, ole10native_00.bin, is the likely payload delivery mechanism.

Heuristics 2

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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ole10native_00.bin` `731cde94f19d80370cf70cd5a138d640ed2bd1ab8320b3f3b2c74d0bc9f6d638`	ole-package	OLE Ole10Native stream: MBD01D76D58/olE10NatIVE	1556 bytes

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