Office (OLE) / .XLS malware analysis — malicious · 1b47cff101a0b05f

MALICIOUS

Office (OLE) / .XLS

68.0 KB Created: 2022-10-06 08:24:44 Authoring application: Microsoft Excel First seen: 2022-10-06

MD5: 55b4659e1881b08157b84a06add9164c SHA-1: 95fe5b0218770c7f336520242c6a53015d45da71 SHA-256: 1b47cff101a0b05fb2f1bd7d92825f73226767fbb32d705b05723941056ad431

188 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical heuristic OLE_VBA_SHELL indicates the presence of shell execution within the VBA macros. The script attempts to download a payload from the reconstructed URL '3uAr7l;hLt21tKOp3s0:/12Q/Ss7Nim3SipiOO8mi.20cDOoVm5' using the QueryTables object, which is a common technique for initial access and malware delivery. The ClamAV detection further confirms its malicious nature 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` `923e80110eaaf8988488643d1b3137e7f8ec4522c327f1e2aee8f922c07d8719`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3400 bytes

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