Office (OLE) / .XLS malware analysis — malicious · 488c1791a47b4a9c

MALICIOUS

Office (OLE) / .XLS

1.03 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-23

MD5: 070d42383580016d48f3668f494622df SHA-1: 6727e1b7af0e597c8441627721c649e1ec07e4f5 SHA-256: 488c1791a47b4a9c2bc4b6adf62cb81fe9b76abac6b4246fae3d89cff9f054e9

108 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

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 file is designed to exploit this vulnerability upon opening. The VBA macros, though not containing executable statements themselves, are part of the overall structure that facilitates the exploit.

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` `ed8da65f0f0a4cc2a905cfcf1ae916bf05ced375ebeefae9a837c8bf84ad6699`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3618 bytes
`ole10native_00.bin` `d09081d7959bd7f632786b560e1cb64061a1066684c3ee87337d3f562c34312a`	ole-package	OLE Ole10Native stream: MBD0295B3E8/OlE10naTIve	1634 bytes

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