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

Static analysis result for SHA-256 85b566502e78374c…

MALICIOUS

Office (OLE) / .XLS

158.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: c11bc483c94e7e0b0497e79e2143fd59 SHA-1: 752bd0cdcb3b67615d4fd754e9875129ece223b2 SHA-256: 85b566502e78374ce4e086d4332bf5e348538fce3d07316c7157d6501e201afa
360 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The critical heuristics indicate the presence of a Workbook_Open macro that utilizes WScript.Shell to download and execute a file. This is a common pattern for macro-based malware droppers. The VBA code explicitly uses WScript.Shell, suggesting a command-line execution vector.

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
75ad260b2d425ff475a2580a54c51d643a41ef2cf01045f1437f150a4756f471		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 27821 bytes

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