Office (OLE) / .XLS malware analysis — malicious · 49bf8f7c260aa122

MALICIOUS

Office (OLE) / .XLS

572.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-07

MD5: 50b4703dce53aac106d5930b101cf46e SHA-1: 507aed446db76089511afcfb3fe742f10b7122f1 SHA-256: 49bf8f7c260aa122204eea6bf5538aae6d8557e4ad76cbcc59cdcf0dce374705

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an Equation Editor OLE object. The document body, formatted as a purchase order, is a common lure for such exploits. No VBA macros were found to be executable, suggesting the primary attack vector is the OLE object itself.

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` `40a26fd19d0153db72e9723cddd15f84f83c00117994d5310d3ccd8c84d9bbac`	ole-package	OLE Ole10Native stream: MBD0132ED60/ole10NATIve	1560 bytes

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