Office (OLE) / .XLS malware analysis — malicious · 74d50bebc34d129a

MALICIOUS

Office (OLE) / .XLS

844.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-21

MD5: f42fffb334aa0c2a7bec7f5c6c1fee11 SHA-1: 9ecff2c3341df2f85fdbe1ba44119c5ad8434908 SHA-256: 74d50bebc34d129ac97c653c74ac63a6f7645fdac1fff1bc1f1207c450f957bf

108 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This vulnerability is commonly used to deliver secondary payloads. Although no VBA code was found to be executable, the presence of the exploit object strongly suggests malicious intent. The file is an Excel spreadsheet, likely delivered as a phishing attachment.

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` `5141b098246ef6540c134ab6c3eb6287a4b95dbe3528b58ab045773bf0917dfe`	ole-package	OLE Ole10Native stream: MBD01D8297B/Ole10nATivE	1684 bytes

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