Office (OLE) / .XLS malware analysis — malicious · a4b51abf49ed7902

MALICIOUS

Office (OLE) / .XLS

616.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-03-03

MD5: 90f2d3a75cb86c76be8d01bfd8867693 SHA-1: 3bb7eeb293a7859100d71af3c649e837ae0eef27 SHA-256: a4b51abf49ed79024d44cb91205b233892e69b58b6a60c36c709f0037ee5b36e

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution T1559.001 Component Object Model Hijacking T1187 Exploitation for Client Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. The presence of an OLE object containing this payload strongly suggests that the file is designed to leverage this exploit. No VBA macros were found to be executable, and no document body text was available for analysis, but the Equation Editor exploit is sufficient to classify the attack pattern. The file is likely a malicious document designed to execute arbitrary code via the Equation Editor 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` `7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1206 bytes
`ole10native_00.bin` `413d54da4fb366f0014b69174b899a06d92cd8b11850a7b8a89a2ba6a61237b9`	ole-package	OLE Ole10Native stream: MBD0093D29E/OLE10NativE	1862 bytes

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