Xls.Downloader.94c25b356b5a6cac-9978798-0 Office (OLE) / .XLS malware analysis — malicious · 7d437966daa691b0

MALICIOUS

Office (OLE) / .XLS

2.12 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-18

MD5: c7f18e65d27dc500b5bbc71f540049f7 SHA-1: 7d2df23770eb962390d464abf7661d9a39065e5b SHA-256: 7d437966daa691b030d9b127ffd9be87d292411e4f08a98b7ea36a28db639d8d

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 indicates the file exploits a vulnerability in the Equation Editor OLE object. The ClamAV detection further confirms its malicious nature as a downloader. No VBA macros were found to be executable, suggesting the exploit itself is the primary delivery mechanism for the embedded 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.
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` `ebe92a08d6f9f1daf128735caafdbdb83d442018be27f50dc7eb88fad5169070`	ole-package	OLE Ole10Native stream: MBD01FBEB01/ole10naTiVe	1580 bytes

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