Office (OLE) / .XLS malware analysis — malicious · 53560a2f4539618f

MALICIOUS

Office (OLE) / .XLS

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

MD5: 6ee345e07d729dc67be58d9f4d714cd7 SHA-1: e3048b4cb23be971dc02532a26a66f891ec50744 SHA-256: 53560a2f4539618ffbc4951d192f9db8c9d196792cfd790489ebd1c107abba2f

110 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The sample is an Excel file containing a malicious Equation Editor OLE object. This object exploits CVE-2017-11882, a known vulnerability that allows for arbitrary code execution. The VBA macros are present but contain no executable statements, indicating the exploit is delivered via the OLE object itself rather than macro code. The embedded URL was confirmed benign and is likely a false positive or unrelated to the exploit.

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` `0076a3b9b51a9f4fe11c5ba2d047de12e1f7fbf99b7eef8077b207a72b3cae9a`	ole-package	OLE Ole10Native stream: MBD01A112EB/ole10natiVe	1707 bytes

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