Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 2c44c1312a4c99e6…

MALICIOUS

Office (OLE) / .XLS

69.5 KB Created: 2022-12-27 08:12:56 Authoring application: Microsoft Excel First seen: 2022-12-27
MD5: 27b43c5bb1b0a1f53671c1bca9ee1a7f SHA-1: 013a0baa2cd00c2c9d98978a61dfe4dfed330d18 SHA-256: 2c44c1312a4c99e689979863e7c82c474395d6f46485bd19d0ee26fc3fa52279
348 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer T1204.002 Malicious File

The VBA macro contains critical heuristics indicating the use of Shell() and WScript.Shell, along with a critical finding for downloading and executing a file via HTTP. The script uses CreateObject to instantiate Microsoft.XMLHTTP and ADODB.Stream to download a file to disk, strongly suggesting a downloader functionality. The presence of WScript.Shell references further supports the execution of downloaded payloads.

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
d47c11c549e93befac5f0323e84435236abf48c8df536f617f7bb6b080032c85		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4184 bytes

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