Xls.Downloader.94c25b356b5a6cac-9978798-0 Office (OLE) / .XLS malware analysis — malicious · 865d5468ca9348d4

MALICIOUS

Office (OLE) / .XLS

1.43 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-13

MD5: 4bfd3f854ca4c4fc84755a9665d3b2ae SHA-1: cdc98538fc0dd2c2fc4b33d9392c75a92e47e805 SHA-256: 865d5468ca9348d4469a7c74b0bf15c9fec739175bb2336e255c9e7e033f19ba

168 Risk Score

Malware Insights

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

MITRE ATT&CK

T1204 Malicious File Execution T1059.005 Visual Basic

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates exploitation of a vulnerability in the Equation Editor. This is further supported by the ClamAV detection name 'Xls.Downloader', suggesting the file's purpose is to download additional malware. No VBA code was found to be executable, but the presence of the exploit object is sufficient evidence of malicious intent.

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.
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.

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` `5bed566c15359b76c2b1d8f21458cf0ba78341a77355173069e26428626c626e`	ole-package	OLE Ole10Native stream: MBD00FA571E/ole10NATivE	1862 bytes

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