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

Static analysis result for SHA-256 c1f218a24f829465…

MALICIOUS

Office (OLE) / .XLS

100.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-09-19
MD5: 55e0c24ad93d53e9a161d813f09d9e9a SHA-1: e3b6b703b99801b32a4c9754d591383dc30432bb SHA-256: c1f218a24f82946584e59d64abc9762e85614803fe82c432d21678d1ae000db5
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 downloads a second-stage payload from the URL 'https://transfer.sh/gdt/YTYp0DR/abd.exe' and saves it as 'C:\Users\Public\gg1c8.exe'. The downloaded file is then executed. This behavior is indicative of a downloader malware.

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.

FilenameKindSourceSize
macros.bas
b694bb64cdf654c597130490b491193eb7fa5de945c3ff185df683548c2b80e7		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1211 bytes

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