Office (OLE) / .XLS malware analysis — malicious · dfc1e61d66e3b944

MALICIOUS

Office (OLE) / .XLS

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

MD5: 559fd1a4fd138a8871a3a7ed58d51f6f SHA-1: a01389a763f9dbd26f566b234750779baede54cc SHA-256: dfc1e61d66e3b94424bbf3e3a31d11d76497b11d629b539537e104dba3df8a59

110 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor object, which is known to be vulnerable to CVE-2017-11882. This vulnerability allows for the execution of arbitrary code when the object is opened. No VBA macros were found to be executable, but the presence of the vulnerable OLE object strongly indicates an exploit attempt. The embedded URL was confirmed benign and is likely a false positive or unrelated metadata.

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` `5b54c65feeaa5d88508ac2cebf7d451e44ea0c7fbc38e53ebb5a0a35780674b1`	ole-package	OLE Ole10Native stream: MBD016E6721/OLe10NatIve	1603 bytes

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