Office (OLE) / .XLS malware analysis — malicious · a7225665972f4210

MALICIOUS

Office (OLE) / .XLS

512.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-14

MD5: a85424f2fb6f690b5f336928355673d1 SHA-1: c4521733d1be82583743a0c33b035a527c791d13 SHA-256: a7225665972f421022ded04315aa75f15cda747e12dbd82130b1a8e87c9d062d

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1059 Command and Scripting Interpreter T1059.005 Visual Basic

The file contains an embedded Equation Editor OLE object that exploits the CVE-2017-11882 vulnerability. This vulnerability allows for arbitrary code execution when the object is processed. No VBA macros were found to contain executable statements, but the presence of the exploit object is sufficient for malicious execution. The file is therefore classified as a malicious document leveraging a known exploit.

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` `24d9d4f97d231d199e00f6db259fc2d0dae7272385902ace45e6e91e0bb5519c`	ole-package	OLE Ole10Native stream: MBD014F0B5D/oLE10NaTive	2044 bytes

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