Office (OLE) / .XLS malware analysis — malicious · 6529b90573955200

MALICIOUS

Office (OLE) / .XLS

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

MD5: 085a7f0164eaad9473287b00da0c1e88 SHA-1: d79bfcc26c717c7ba7b788b652d7f28bd2eb3630 SHA-256: 6529b9057395520064b236f87fd46a0b746889a09fa3aa923842a03137cbe557

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

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 an Equation Editor payload strongly suggests this attack vector. While no VBA macros were found to contain executable statements, the exploit itself is the primary mechanism for payload delivery.

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` `de78ebb8af11bda8997dda202f61bf1bde2eecba81f39cdd6c9f3cce6a0df390`	ole-package	OLE Ole10Native stream: MBD0186493D/olE10NatIvE	1209 bytes

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