Xls.Downloader.94c25b356b5a6cac-9978798-0 Office (OLE) / .XLS malware analysis — malicious · e48714654ee87598

MALICIOUS

Office (OLE) / .XLS

1.58 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-07

MD5: 588ac5c5f2d9614817b10d598f495fdd SHA-1: a2481fc47f53b392dc58a8ec8a10e04b00953b0a SHA-256: e48714654ee875981960049cbdc73041027f9ab94f97a0153b524552503e6d5f

170 Risk Score

Malware Insights

Xls.Downloader.94c25b356b5a6cac-9978798-0 · confidence 95%

MITRE ATT&CK

T1204 Malicious Link T1059.005 Visual Basic

The file contains an embedded Equation Editor OLE object that is known to exploit CVE-2017-11882. This vulnerability allows for the execution of arbitrary code, typically used to download and run a second-stage payload. The ClamAV detection name further supports its role as a downloader.

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.
ClamAV: Xls.Downloader.94c25b356b5a6cac-9978798-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.94c25b356b5a6cac-9978798-0
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` `378f45dfd1f5f94b03fd55773b217a54a6aac4473382a73fbea721d2f88b4a05`	ole-package	OLE Ole10Native stream: MBD01329242/OlE10NATIVe	1693 bytes

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