Xls.Downloader.b83ac4c497e169b5-9980307-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 27070a66fc07ff72…

MALICIOUS

Office (OLE) / .XLS

53.5 KB Created: 2022-12-27 08:20:12 Authoring application: Microsoft Excel First seen: 2022-12-28
MD5: 7f1c1f1d7e85ed165936b4597dd5ba6e SHA-1: 07fe35bd9fbd2f26e6fcf7e586c1554f192c259c SHA-256: 27070a66fc07ff721a16c4945d4ec1ca1a1f870d64e52ed387b499160a03d490
348 Risk Score

Malware Insights

Xls.Downloader.b83ac4c497e169b5-9980307-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059.003 Windows Command Shell

The VBA script contains critical heuristics indicating the use of Shell() and WScript.Shell, along with a direct call to download and save a file from a URL using HTTP .ResponseBody and .SaveToFile. The embedded URL 'agenzia.gov.it' is likely the source of the second-stage payload. This indicates a downloader functionality designed to fetch and execute further malicious content.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • ClamAV: Xls.Downloader.b83ac4c497e169b5-9980307-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.b83ac4c497e169b5-9980307-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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.

FilenameKindSourceSize
macros.bas
e5512ff867d5750a58f7c1f5e4a0d47b12d2b3b39a2b02482fd2e550a75b41f6		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4180 bytes

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