Office (OLE) / .XLSX malware analysis — malicious · afa915e7174b5c3d

MALICIOUS

Office (OLE) / .XLSX

637.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-24

MD5: 307fee76a6790b07f15db9f78204d0a7 SHA-1: f6876b7d784f9ccebbb4f69b0142d0e35204a0e9 SHA-256: afa915e7174b5c3da177ea2bc6573248a00d173dfe8f2ff8e7667557a3bf699f

108 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.002 Phishing: Spearphishing Attachment

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This technique is commonly used to execute arbitrary code, often as a precursor to downloading and running further malicious payloads. The presence of VBA macros, though reported as not containing executable statements, along with the Equation Editor object, strongly suggests a malicious document designed for exploitation.

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 3

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` `aebfa3cc9cffd1af88424a4828f90c2a91932c7006bd1640e9ae65f18d99a7e2`	ole-package	OLE Ole10Native stream: MBD02C46372/Ole10Native	167172 bytes
`ole10native_01.bin` `7cb7975eabc6edd62f865d6d6c7ef614f3fe55c18f8bba04c85b1cd603cd46c6`	ole-package	OLE Ole10Native stream: MBD02C46373/olE10naTIve	1800 bytes

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