Office (OLE) / .XLS malware analysis — malicious · 6f29c2e790542e9e

MALICIOUS

Office (OLE) / .XLS

393.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-08

MD5: f36de0c475c53454ac9968d5f3c0a2e6 SHA-1: 2e62730d938c8b3116cba193da738d09e59d5f33 SHA-256: 6f29c2e790542e9e563e3eaf13a42f8c792e442ea4f7f3e5eb6213706fb7216a

148 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1559.001 Component Object Model Hijacking

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a vulnerability within the Equation Editor OLE object. This technique is commonly used to deliver secondary payloads. No VBA macros were found to be executable, and the document body was not parsable, suggesting the exploit is the primary mechanism for compromise.

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.
x86 GetPC stub (CALL $+5; POP ESI) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP ESI)
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` `0ef1c6c5cf606ac75e637bae27be058fc65f90b60ae6aa40afb98947ceb59f58`	ole-package	OLE Ole10Native stream: MBD0157D30B/OLe10native	1261 bytes

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