Office (OLE) / .XLSX malware analysis — malicious · 1e8765b46e8442b8

MALICIOUS

Office (OLE) / .XLSX

63.5 KB Created: 2022-11-10 08:03:39 Authoring application: Microsoft Excel First seen: 2022-11-10

MD5: 7aebaec00655709f98856dafe1b4acda SHA-1: f0f6d33cb0d91b4a819251c0480e88ed9b1773bd SHA-256: 1e8765b46e8442b82a7495fa63da2fda7113350eed74e020471802b0b5852b61

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1140 Deobfuscate/Decode Files or Information T1071.001 Web Protocols

The sample contains VBA macros that utilize Shell() and CreateObject() functions, indicating malicious intent. The script attempts to download a payload from the reconstructed URL "http://1y2ou4bi60ci.com/c12o-m" using Base64 decoding and saves it as "C:\Users\Public\9cal9c.exe", likely to be executed via rundll32.exe. This suggests a downloader functionality.

Heuristics 5

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
ClamAV: Xls.Downloader.b83ac4c497e169b5-9980307-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.b83ac4c497e169b5-9980307-0
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `121647c3595ee9c076aa6008c3d8902f97a20693821367b437b54d88a852b244`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3123 bytes

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