Office (OLE) / .XLS malware analysis — malicious · 99575c40eb6df851

MALICIOUS

Office (OLE) / .XLS

1.02 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-08

MD5: a4dcb8dc89a5e3c6a772887d58969cf3 SHA-1: f877b98285c2f903fe7dbbe074d81d213bb1355f SHA-256: 99575c40eb6df85130e56b622b7c1fa58f20d821e404363af7cbf14c501cf8de

150 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file contains an embedded Equation Editor OLE object that is known to be vulnerable to CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is rendered. No VBA macros were found to be executable, but the presence of the vulnerable object strongly indicates an exploit attempt.

Heuristics 5

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 EBP) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP EBP)
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` `ad2e7fb9ebeba35107ec16ff360cc17b30c10cd41eb7f41701908a5cb6105963`	ole-package	OLE Ole10Native stream: MBD01A5D928/ole10naTIVe	1781 bytes

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