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

Static analysis result for SHA-256 644c4d8e1df0f7ae…

MALICIOUS

Office (OLE) / .XLS

61.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: e89259df459a4658d9d97fc964705dad SHA-1: f6134239d4a25fe4f7465ecc0eb52bf06623d658 SHA-256: 644c4d8e1df0f7ae73497d7d5f94ce806e54b611b2ca60cf28ea0a695b28f2d3
380 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File: User Execution T1105 Ingress Tool Transfer

The sample is a Microsoft Excel file containing a Workbook_Open VBA macro. This macro uses WScript.Shell to download and execute a second-stage payload, as indicated by the 'OLE_VBA_HTTP_DROP_EXEC' and 'OLE_VBA_WSCRIPT' heuristic firings. The document body explicitly instructs the user to 'Enable Content', a common lure for macro-based malware.

Heuristics 9

  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
68b2e558a6020c532c60f666052f6350e2ea0c88a0c010f70c8bcbd8f6e97728		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 13081 bytes

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