Office (OLE) / .XLS malware analysis — malicious · 113ca964a7af99c1

MALICIOUS

Office (OLE) / .XLS

204.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-10-19

MD5: 0fb383b858a279b5812670db5a03807c SHA-1: 981f5c213a88c8ef447760f410a18ddc126c4717 SHA-256: 113ca964a7af99c1c14eef588707d3b5d7761f120d80f7e2c1635f1a7e68e6ab

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The critical heuristic firing indicates the presence of a payload associated with CVE-2017-11882 within an Equation Editor OLE object. This exploit is commonly used to deliver secondary malicious payloads. The file type is an Excel spreadsheet, suggesting it was likely delivered as an attachment.

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` `e0643d91671c0c3a1d70417eb8c254a4d9ea2b6672bbdf6c8daf1d533226c360`	ole-package	OLE Ole10Native stream: MBD04546FCF/ole10NAtive	1471 bytes

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