Office (OLE) / .XLS malware analysis — malicious · 8340f192a38f93e6

MALICIOUS

Office (OLE) / .XLS

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

MD5: 3c8761ae223c4e16060ec46b42d46ca6 SHA-1: e52161319d8a16f308912d3fcfe834c31de4a411 SHA-256: 8340f192a38f93e6ad8fc515505e2d2a9d8b0457e3f2d684a60ba292aa8c1cd0

108 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious File

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability within the Equation Editor OLE object. The presence of an OLE object and VBA macros, though the latter are not executable, further supports this. The file likely serves as a dropper for a secondary exploit or payload, leveraging the CVE-2017-11882 vulnerability.

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` `1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2412 bytes
`ole10native_00.bin` `34c839b297c69953c57f3e5c6a51f80c32059e3605fbe6687be8c26ce65e35bb`	ole-package	OLE Ole10Native stream: MBD01568721/oLE10nATIVe	1739 bytes

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