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

Static analysis result for SHA-256 c2043e9cf8c824ec…

MALICIOUS

Office (OLE) / .XLSX

46.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2024-06-21
MD5: 4826e4546a70d30db8513dc36a533abd SHA-1: 96b907780845121406f60a88bd58d144a771721d SHA-256: c2043e9cf8c824ecbf26e6c975e8bd8df11dea569236d46ba415694ced2848d3
360 Risk Score

Malware Insights

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

The Workbook_Open macro is designed to execute arbitrary code. It utilizes WScript.Shell to download and execute a payload, as indicated by the critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristics. The VBA code also contains obfuscated strings and function calls, further suggesting malicious intent.

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.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
803204815594765a8f2b21148ea40df2359fe84e2e998247620fb0dbe9488dac		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 27038 bytes

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