Office (OLE) / .XLS malware analysis — malicious · 358d98315a50a4f9

MALICIOUS

Office (OLE) / .XLS

393.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-07

MD5: 013366b13a65aeeeeaf76fa0a99dedd3 SHA-1: 6baa6afb9035afe3ac3acfdf5f9f23c6bcda9bbf SHA-256: 358d98315a50a4f9e8e0b990dbc333144ac930a6401edb7c3ae8323041e937b3

148 Risk Score

Malware Insights

MITRE ATT&CK

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

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 the file is designed to exploit this vulnerability upon opening. No VBA macros were found to be executable, and the document body was unreadable, but the Equation Editor exploit is sufficient to classify this as a malicious delivery mechanism.

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 EBX) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP EBX)
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` `f587da9346fb04b407a9b24739990704aa1b6180b6c3e8bd983be4afc117df65`	ole-package	OLE Ole10Native stream: MBD01331B07/olE10NaTive	1600 bytes

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