Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c1d4edd087782662…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:45:07 Authoring application: Microsoft Excel First seen: 2021-10-05
MD5: fa6bac6c157950aaacb77db73c2383b1 SHA-1: 0b6570dba1bfe46f1a93ddf577b273c4d31a3a1a SHA-256: c1d4edd087782662f836173adaba64350963a21f1157d32dd131ae939d848a48
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known method for executing malicious code within older Excel versions. The critical heuristics indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting an attempt to run arbitrary commands or exploit vulnerabilities. No specific URLs or further payloads were extracted, but the presence of the Auto_Open macro is a strong indicator of malicious intent.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6547 bytes
SHA-256: d8907dd27fb0659789b1e1691481fcdfc0df79c30ef9de1fc06a265564899bd2
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  BNCxEQuNX
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B131 
' 0018     27 LABEL : Cell Value, String Constant - aWUdnJoKEFlg len=0 
' 0018     23 LABEL : Cell Value, String Constant - CBxRxdia len=0 
' 0018     20 LABEL : Cell Value, String Constant - ccYCW len=0 
' 0018     27 LABEL : Cell Value, String Constant - DVaJOBVyPtsa len=0 
' 0018     23 LABEL : Cell Value, String Constant - ffqwOlIE len=0 
' 0018     24 LABEL : Cell Value, String Constant - GalMkPFzM len=0 
' 0018     22 LABEL : Cell Value, String Constant - iDBdIUI len=0 
' 0018     25 LABEL : Cell Value, String Constant - IqpTeaEQkZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - jkjXHULf len=0 
' 0018     26 LABEL : Cell Value, String Constant - jomtHkIylti len=0 
' 0018     21 LABEL : Cell Value, String Constant - jvGKYN len=0 
' 0018     23 LABEL : Cell Value, String Constant - nArrrbGE len=0 
' 0018     23 LABEL : Cell Value, String Constant - OQkJZiSZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - qcmTAC len=0 
' 0018     21 LABEL : Cell Value, String Constant - TFjixU len=0 
' 0018     22 LABEL : Cell Value, String Constant - tQNvwwI len=0 
' 0018     26 LABEL : Cell Value, String Constant - UgJGTTfdiNY len=0 
' 0018     23 LABEL : Cell Value, String Constant - wfJaYxgE len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZEFsbqqb len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZSmGoh len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10
... (truncated)

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