Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7e4828ecf8f0f51e…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:46:55 Authoring application: Microsoft Excel First seen: 2021-09-29
MD5: 3c667e451e03001bc4371de2dc6124bf SHA-1: 0a5c85541e673f9796cf7553e93136de588a9183 SHA-256: 7e4828ecf8f0f51ec03b604aeb8ff696a6ede9888435dbab1dcb06a4333cf300
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. The heuristics indicate the use of dangerous formula APIs within the macro, suggesting an attempt to run arbitrary commands. No specific URLs or hashes 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) 6607 bytes
SHA-256: 3b4389994bafcb9c030cf5ae126e33e4d94dad1b83dc8ef051cec648023ade39
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  lUKi
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C192 
' 0018     23 LABEL : Cell Value, String Constant - bOqOjBUm len=0 
' 0018     20 LABEL : Cell Value, String Constant - CUfeN len=0 
' 0018     20 LABEL : Cell Value, String Constant - dkSRa len=0 
' 0018     25 LABEL : Cell Value, String Constant - eahhaBifzk len=0 
' 0018     23 LABEL : Cell Value, String Constant - EXPuxQOJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - FGvibuhmrQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - GOawyj len=0 
' 0018     21 LABEL : Cell Value, String Constant - gSivQP len=0 
' 0018     24 LABEL : Cell Value, String Constant - iexHqSHVZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - IZBDmzVcZL len=0 
' 0018     26 LABEL : Cell Value, String Constant - MddVtPyekSz len=0 
' 0018     23 LABEL : Cell Value, String Constant - muJnsfmG len=0 
' 0018     26 LABEL : Cell Value, String Constant - qiGuWKBfeeO len=0 
' 0018     23 LABEL : Cell Value, String Constant - toDzJotZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - TuuMUWNs len=0 
' 0018     24 LABEL : Cell Value, String Constant - UCcZSGPeZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - uspzeRTlmjrO len=0 
' 0018     21 LABEL : Cell Value, String Constant - Wawhlu len=0 
' 0018     24 LABEL : Cell Value, String Constant - xsVSXubVF len=0 
' 0018     27 LABEL : Cell Value, String Constant - YqrpyLBglomd 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     
... (truncated)

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