Office (OLE) / .XLS malware analysis — malicious · 107f3ff4891d7c7d

MALICIOUS

Office (OLE) / .XLS

185.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-01-20

MD5: 0bfff68845402f6a93771b26bc191a0f SHA-1: 4adda955d8050d8e684d4e2c45974073fb288fcb SHA-256: 107f3ff4891d7c7db1a200cc311e6862eac5e7a792afd928a033d39bc9f483ea

110 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor OLE object, which is known to be vulnerable to CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is processed. The VBA macros extracted do not contain executable statements, but the presence of the vulnerable OLE object is sufficient for exploitation.

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.
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.openxmlformats.org/drawingml/2006/main

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` `eac05fe7ec74f5ca21d04e7b53e82e82993490bee2a72635882be7dad5319496`	ole-package	OLE Ole10Native stream: MBD0015FE85/OLE10NAtIVE	2046 bytes

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