Xls.Downloader.Valyria-10008445-0 Office (OLE) / .XLS malware analysis — malicious · e4900bd0ab641c48

MALICIOUS

Office (OLE) / .XLS

100.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-09-18

MD5: 9ff9cd45607fd1c170bcc20fcd87a48e SHA-1: f2dabbe5ef742520697ddc7cd752ded79866699d SHA-256: e4900bd0ab641c485593b5825f8c73b6838fc621f3e347f2174571ca67ebf32d

240 Risk Score

Malware Insights

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

MITRE ATT&CK

T1059.005 Service Execution: Visual Basic T1059.003 Command and Scripting Interpreter: Windows Command Shell T1105 Ingress Tool Transfer

The Workbook_Open macro is triggered upon opening the Excel file. It constructs and executes a command using cmd.exe and powershell to download a second-stage executable from 'https://transfer.sh/get/SkazYLa2BT/happy.exe' and saves it as 'C:\Users\Public\v7idi.exe', which is then executed. This indicates 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` `caa7b17c1a590652b5c0ca4c6c2884bea72d481a8c87cc2971ae4b1554a92a6f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1318 bytes

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