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

Static analysis result for SHA-256 eef0596335d49e18…

MALICIOUS

Office (OLE) / .XLS

47.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: 587d8480a0a0c07b1eafa20edafd4ff4 SHA-1: 0a58332bc94b6f6944d9aa07a2a863bb1fb8265e SHA-256: eef0596335d49e18109754955a5eae8fabd4b6324ed4c7a16c04a873548db968
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

The sample is an Excel file containing VBA macros. The Workbook_Open macro is present and utilizes WScript.Shell to execute commands, indicated by the OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristics. This suggests the macro is designed to download and execute a second-stage payload. No specific family could be identified, and no external IOCs were extracted.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
a18c266b2b006a38b8b1f8aad2ba5eff577314c9910c49be86807ffea867d384		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 26340 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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