Office (OLE) / .XLS malware analysis — malicious · 6be8b2bf83634551

MALICIOUS

Office (OLE) / .XLS

90.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-01-19

MD5: 01d1e58784df874a6fba2c3dee851c74 SHA-1: c4b229364c2f525729f74747952e059efc76d899 SHA-256: 6be8b2bf83634551058621fe2821fb20d02a8a296187adb0a9965ea26c4f39c8

108 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.005 PowerShell

The sample is an Excel file containing an embedded Equation Editor object, which is a known vector for exploiting CVE-2017-11882. The heuristic firings strongly indicate the presence of a payload within this object, likely intended for initial execution. No VBA macros were found to be executable, suggesting the exploit is directly within the OLE object.

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` `7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1206 bytes
`ole10native_00.bin` `cb92b41762b79cd192f35ea4f92debc1fbb0720b2bd79b7f9140b802c6fc41d2`	ole-package	OLE Ole10Native stream: MBD02676562/OLe10NATIvE	1541 bytes

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