Xls.Downloader.b83ac4c497e169b5-9980307-0 Office (OLE) / .XLS malware analysis — malicious · 77f973163216d53d

MALICIOUS

Office (OLE) / .XLS

63.5 KB Created: 2022-11-10 08:16:01 First seen: 2022-11-10

MD5: c8ca23781c7a379dbe2e7503b7d3efba SHA-1: 8095d1dd7a687aab314bd3b45218deec96184e85 SHA-256: 77f973163216d53d3b0c4e4c2d38dfbfc25ea5754e15c0f0f862f5b4cfe1a39c

188 Risk Score

Malware Insights

Xls.Downloader.b83ac4c497e169b5-9980307-0 · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The VBA macros contain a critical heuristic firing for Shell() calls and a CreateObject call, indicating execution of arbitrary commands. The script attempts to download a payload from the reconstructed URL "http://1y2ou4bi60ci.com/c12o-m" and save it as "C:\Users\Public\32.exe", likely to execute a second-stage malware. The ClamAV detection name further supports its classification as a downloader.

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` `41bc2cf7b4e18d1a54f18db46eac0aa290c6bb938cd72557913744e70a76375e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3125 bytes

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