Office (OLE) / .XLS malware analysis — malicious · e850c06fcc2047a0

MALICIOUS

Office (OLE) / .XLS

1.08 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-29

MD5: 1ba6b27bfe5bdfb66c164520da4a9246 SHA-1: 0f9e08cb5700eeaf3f8fea839b5ca26e85d293ea SHA-256: e850c06fcc2047a01fceef6ef7b1b8d8dd1d20139597806d72021ea2aa075bd0

108 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution: Malicious File

The critical heuristic firing for CVE-2017-11882 indicates the exploitation of a known vulnerability in Microsoft Equation Editor. The presence of an OLE object containing a payload strongly suggests this exploit is the primary attack vector. While VBA macros were detected, they contained no executable statements, implying the exploit payload is delivered directly via the OLE object rather than through macro execution.

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` `ed8da65f0f0a4cc2a905cfcf1ae916bf05ced375ebeefae9a837c8bf84ad6699`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3618 bytes
`ole10native_00.bin` `de847e1391e9a6bea0e1acca214a15ec279e6ad647cd8d10a4cf0ba5f959d4b1`	ole-package	OLE Ole10Native stream: MBD0155B224/Ole10naTIvE	1842 bytes

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