Office (OLE) / .XLS malware analysis — malicious · 67c5ef42cf8b4969

MALICIOUS

Office (OLE) / .XLS

382.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-01-24

MD5: 2195e9a10d6067a828c2ba2fa2e6fcc8 SHA-1: ea77c6266185c8848df7a4498e52f37423341d39 SHA-256: 67c5ef42cf8b4969da1661b4d8e4dee542e7c2282dcc44ccb7804b9077a3ced4

110 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.005 Visual Basic

The sample is an Excel file containing a malicious Equation Editor object, which is a known vector for exploiting CVE-2017-11882. The VBA macro, while not containing executable statements itself, is present and could be used in conjunction with the exploit. The embedded OLE object is the primary indicator of malicious activity, likely serving to execute a second-stage payload.

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` `de37e6eec5bc70ea3ec0e5d3654633506259c4ad7c73b9c3fce7b94f0dd3b23f`	ole-package	OLE Ole10Native stream: MBD01759D5C/OLE10nAtIVe	1556 bytes

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