Office (OLE) / .XLS malware analysis — malicious · 188c29dc39bcf0f5

MALICIOUS

Office (OLE) / .XLS

745.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-23

MD5: 36dbbe387ce3851bc3aa42ed8dc48a8d SHA-1: dce1e73be53660393244455de8b630b214df847a SHA-256: 188c29dc39bcf0f5dea8950ae2aebfbaa9efcbbc8ac2e7a5fcffabc9d4fcd99c

148 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The critical heuristic firing for CVE-2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This is further supported by the presence of an OLE object containing an Equation Editor payload. The VBA macros are present but do not contain executable statements, suggesting the exploit is directly within the OLE object.

Heuristics 4

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.
x86 GetPC stub (CALL $+5; POP EDI) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP EDI)
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` `638cae97bff2e1e585dc9c7dbeb1d10432a2f241406c158bd3cd757831d8b1dc`	ole-package	OLE Ole10Native stream: MBD024D6A72/OlE10nativE	1503 bytes

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