Office (OLE) / .XLS malware analysis — malicious · e8fcc57271e5b1ae

MALICIOUS

Office (OLE) / .XLS

1.19 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-01-26

MD5: c3c39f13b005910981453d9b4d88c960 SHA-1: 670bbb56884e014c58b8e1dee1b244759347ad73 SHA-256: e8fcc57271e5b1ae0f4d26896a06af86d31b84a84985fe984e42b2b018a19bab

110 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059.005 Visual Basic

The sample is an Excel file containing an embedded Equation Editor OLE object. Heuristics indicate the presence of a payload exploiting CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. No VBA macros were found to be executable, and the document body is minimal. The primary attack vector appears to be the exploitation of this specific CVE.

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` `03e33a866ac315fb25d1be7d371ecf1c0cc0c491b9f5d42797fb655ea2e84f96`	ole-package	OLE Ole10Native stream: MBD01DA8A0F/OLE10natIVE	1566 bytes

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