Office (OLE) / .XLS malware analysis — malicious · 8a214a9efbabf100

MALICIOUS

Office (OLE) / .XLS

750.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-22

MD5: 3ed8b4038d1d7fcfa3b5e7abfd20f4ba SHA-1: 12063f84a2f2110d26a20bfb5c0f3dbbf5b72a96 SHA-256: 8a214a9efbabf10006b8ac22fee28af0a38eceb5b0c57be4a1b171b29944d9b7

108 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.005 PowerShell

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the file contains a payload designed to exploit this specific vulnerability. The presence of an OLE Equation Editor object further supports this. While VBA macros were detected, they contained no executable statements, suggesting the primary execution vector is the Equation Editor exploit itself, likely leading to the download and execution of a second-stage payload.

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` `1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2412 bytes
`ole10native_00.bin` `ca7fb72339ca33eaf6712612d7dc42742e9714bf319b5728dbe5ada2d242c4f7`	ole-package	OLE Ole10Native stream: MBD0201AEBB/Ole10Native	1416 bytes

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