Xls.Downloader.Valyria-10008445-0 Office (OLE) / .XLS malware analysis — malicious · 4a7daa6f01efcbc7

MALICIOUS

Office (OLE) / .XLS

100.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-09-14

MD5: 100a2750f01f084234fbd828f1f608fc SHA-1: e5c947d03ad2a7a08500275b2107d91f13295066 SHA-256: 4a7daa6f01efcbc7e6480e26f2f99092eb7c059929bc84debd13a7962d0a2a25

240 Risk Score

Malware Insights

Xls.Downloader.Valyria-10008445-0 · confidence 95%

MITRE ATT&CK

T1059.005 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1059.001 PowerShell

The Workbook_Open macro in this XLS file is designed to execute a command that leverages PowerShell to download a second-stage executable named 'boat.exe' from 'https://transfer.sh/get/gj04sqKk7O/boat.exe' and save it as 'kzcnu.exe' in the user's public directory. The macro then executes the downloaded file, indicating a downloader functionality.

Heuristics 6

ClamAV: Xls.Downloader.Valyria-10008445-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Valyria-10008445-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
GetObject call high OLE_VBA_GETOBJ

GetObject call
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `f5910a9ce53e0b41215f5e1e1e5f98542471392a6cbd22bd014d8204b42c2ef8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1228 bytes

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