Xls.Downloader.b83ac4c497e169b5-9980307-0 Office (OLE) / .XLS malware analysis — malicious · 647f98063490455c

MALICIOUS

Office (OLE) / .XLS

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

MD5: b432e2c4cb08172c706e96562dbc2435 SHA-1: c58b365868fa43b93afacd9f6516dc4255185d79 SHA-256: 647f98063490455c25e9645e1039168d8327e630b84e9343f5fa1fbd6bc88cab

188 Risk Score

Malware Insights

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

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The VBA macros contain critical heuristics for Shell() and CreateObject() calls, indicating execution of arbitrary code. The script attempts to download a payload from the reconstructed URL "http://1y2ou4bi60ci.com/c12o-m" and save it as "C:\Users\Public\96al9c.exe", likely to be executed via rundll32.exe. This strongly 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` `41bc2cf7b4e18d1a54f18db46eac0aa290c6bb938cd72557913744e70a76375e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3125 bytes

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