Office (OLE) / .XLS malware analysis — malicious · 3912cd99823a4ab2

MALICIOUS

Office (OLE) / .XLS

1.54 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-06

MD5: 3d495c348238d2b882dbd33e7c87b083 SHA-1: 1333f588040498bd828c81f2a9090badd46ee54d SHA-256: 3912cd99823a4ab2c785ba3eb8de1a5253057c910880649ba54bc1d5ae06581c

108 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.005 PowerShell

The file contains an embedded OLE object specifically identified as a payload for the CVE-2017-11882 Equation Editor vulnerability. While the VBA macros themselves appear to contain no executable statements, the presence of the vulnerable OLE object strongly indicates an attempt to exploit this known flaw for initial execution. The exact nature of the second-stage payload is not discernible from the provided VBA code, but the exploit itself is the primary attack vector.

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` `1ff501b60ae763094904859201bf6bb23ad812a77ac2ef200218166936d5718c`	ole-package	OLE Ole10Native stream: MBD00B51C8F/Ole10Native	1876 bytes

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