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

Static analysis result for SHA-256 1638386082d45b4d…

MALICIOUS

Office (OLE) / .XLS

254.0 KB Created: 2022-11-09 16:25:45 Authoring application: Microsoft Excel First seen: 2022-11-10
MD5: 61606dcf2c5deb3560ddd31171ec400e SHA-1: 84932fd3d4b4d8fb1fdc55a2a4d88498e9a1d80b SHA-256: 1638386082d45b4dc71071e405436b0c5ad9a9e08f2ecba55513fc830bd829ac
462 Risk Score

Malware Insights

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

The sample contains VBA macros that leverage WScript.Shell and CreateObject to download a file from the embedded URL and execute it. The AutoOpen and Workbook_Open macros are triggered upon opening, initiating the malicious chain. This behavior is consistent with a dropper malware designed to fetch and run a secondary payload.

Heuristics 11

  • 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: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://37.139.128.94/fx/IMG050-1207-035.exe

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
d7e7d9dcf0ecdd347adf1c6e67ff7a555bb389e847e0bbc87745734034f9e082		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 98263 bytes

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