Office (OLE) / .XLS malware analysis — malicious · aa5191030da1639b

MALICIOUS

Office (OLE) / .XLS

1.18 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-22

MD5: 627894e2433cca94ebde5f23952947fe SHA-1: 343b59eb17e2807858074d47bfa9842b2f6b2b77 SHA-256: aa5191030da1639bd486c65abfd8077eb4ddb31cd7b8b3f09df126ccb0623035

110 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 Microsoft Equation Editor. This, combined with the OLE_EQUATION_EDITOR heuristic, strongly suggests the file is designed to exploit this vulnerability. The VBA macros are present but appear to contain no executable statements, indicating they are not the primary vector. The embedded URL was confirmed benign and is likely a false positive or unrelated metadata.

Heuristics 4

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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.openxmlformats.org/drawingml/2006/main

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` `778ef1d6c077bb7cd9ea4a2cff744b8f39920b95bbc4418bb541427dd3bbdd91`	ole-package	OLE Ole10Native stream: MBD00DA1A5B/OLE10NATive	1369 bytes

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