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

Static analysis result for SHA-256 3d6e7ac455ce2600…

MALICIOUS

Office (OLE) / .XLS

73.5 KB First seen: 2022-03-04
MD5: cb125d7bd1e4845b398a579bff9473e1 SHA-1: 27764a42e6d899e736f9699a72c1bbf8a32da74c SHA-256: 3d6e7ac455ce2600d7c6362a2168588d840483c7170ab07b8dd7e1b2ff82cff1
262 Risk Score

Malware Insights

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

The critical OLE_VBA_SHELL heuristic indicates that the VBA macro within the Workbook_Open event is designed to execute a command. The script reconstructs a command that downloads a file from 'http://manfam.co/npz' to the user's desktop as '1234.exe' and then executes it. This is a common dropper pattern.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Dropper.Generic-6595971-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Generic-6595971-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://manfam.co/npz\

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a761f608c3c0ad11d6e5453743a3cdef85f04ad52ec697552c87cb897f66c999		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3127 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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