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

Static analysis result for SHA-256 ef02701e2196f54b…

MALICIOUS

Office (OLE) / .XLS

155.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2023-01-03
MD5: bb53eadd474551b0061c626f22fcd806 SHA-1: 370ebedc5723854eff86d8c1369134b6f29ef772 SHA-256: ef02701e2196f54b5858bcb67a41d34fc9a5f248efdae181c701c200950d638d
362 Risk Score

Malware Insights

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

The sample is a macro-enabled Excel file that contains a Workbook_Open macro. This macro utilizes WScript.Shell and CreateObject to download and execute a file, indicated by the 'OLE_VBA_HTTP_DROP_EXEC' heuristic. The obfuscated VBA code suggests an attempt to conceal the payload delivery mechanism.

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
  • Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e69e16f1c94b3b747b1924577415c9f0118440015fd96ef00281411615bbfbe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 15211 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 69 long base64-like blob(s).

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