Office (OLE) / .XLS malware analysis — malicious · a833981e3acfe23d

MALICIOUS

Office (OLE) / .XLS

393.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-09

MD5: f90af4e2413c68078e5471850f514e5a SHA-1: 0ce8e9820483b2a348446bc4d05b2c5117f1548b SHA-256: a833981e3acfe23d8a299bb385b3e2e4df2097d031605f5389d03c94b93d54ac

108 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The critical heuristic firing for CVE-2017_11882_EQUATION_OLE10NATIVE indicates that the sample contains a payload designed to exploit this specific vulnerability in Microsoft Office's Equation Editor. The presence of an OLE object containing this payload strongly suggests an attempt to achieve arbitrary code execution upon opening the document. No VBA macros were found to be executable, and the document body was unreadable, leaving the Equation Editor exploit as the primary indicator of malicious activity.

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.
VBA project contains no executable statements low OLE_VBA_MACROS

Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1206 bytes
`ole10native_00.bin` `fe10331174cd065bdb165aa038e888f57f77006482d7c5af4b8d818b099e1661`	ole-package	OLE Ole10Native stream: MBD01E8FF80/OLE10NAtIVE	1764 bytes

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