Valyria Office (OLE) / .XLS malware analysis — malicious · bc127ab9ae260521

MALICIOUS

Office (OLE) / .XLS

100.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-09-22

MD5: 5014be5bf154ed9bbfe3b5868ad702d1 SHA-1: 1ccadf970129812badcb86515d286ff1d6dd5200 SHA-256: bc127ab9ae2605214e214b69cda0597477f8bc4b903d5215dd9e221cda0991b5

240 Risk Score

Malware Insights

Valyria · confidence 95%

MITRE ATT&CK

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

The Workbook_Open macro executes a command that uses PowerShell to download a file named 'Egrom.exe' from 'https://transfer.sh/gt/JWNONUaUMt/Egrom.exe' and saves it as 'C:\Users\Public\z3usy.exe'. The downloaded executable is then immediately executed, indicating a downloader functionality. The ClamAV detection name 'Xls.Downloader.Valyria-10008445-0' further supports the downloader classification and suggests the Valyria family.

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` `eda2a2806bdee19d407b32798374548617312b0f2f2ee34678d2c393abc22ec5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1228 bytes

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