Office (OLE) / .XLS malware analysis — malicious · 66ec2ab15339cd87

MALICIOUS

Office (OLE) / .XLS

1.08 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-29

MD5: 0e425718e0b9018466cb365ebef6849f SHA-1: 0a169482aa9b5fd97ba06168632a392af9ea0baf SHA-256: 66ec2ab15339cd87a85251ab25ce2f9c72ea07f3e9368b3c11833664a6d76d7b

108 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 technique is commonly used to deliver secondary payloads. Although the VBA macros themselves contain no executable statements, the presence of the Equation Editor OLE object strongly suggests an exploit attempt.

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` `3e51311891dba2655281cd1968ce278c378adf3a548502ee9660e47efb676f63`	ole-package	OLE Ole10Native stream: MBD01556EE5/OLE10nAtive	1701 bytes

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