Office (OLE) / .XLSX malware analysis — malicious · f73bbf861850e77f

MALICIOUS

Office (OLE) / .XLSX

160.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-10-27

MD5: 8a3869284293245ae8d3c58c9171e968 SHA-1: bc67d2a9a18131ce7dae3ce265d03b60709010da SHA-256: f73bbf861850e77f0f8f832a2c51e7533a61cd754f83cbf66e9d308294db541d

100 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE strongly indicates exploitation of this known vulnerability. The presence of an Equation Editor OLE object further supports this finding. The exact nature of the payload is not detailed, but the exploit itself is the primary indicator of malicious intent.

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` `4830d0bdeb23c00e45b39a438bc53462af24b085376b8cfa524b1e7935e24767`	ole-package	OLE Ole10Native stream: MBD014A5868/oLE10natIvE	1926 bytes

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