Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e691b84ec8b9031b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:10 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: b477b81a80cdea2624b580352f01ae56 SHA-1: f74d4459c97e156021f6ab3040e02f90a0038e5f SHA-256: e691b84ec8b9031b04003e683fdd8f95cf41c2acdb681fd8f6ba3783f4deb46e
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet that contains an Auto_Open defined name, indicating that it is designed to execute code automatically when the workbook is opened. The critical heuristic 'OLE_XLM_DANGEROUS_FN' indicates the use of dangerous formula APIs within the macro, suggesting an intent to perform malicious actions. No specific IOCs like URLs or hashes were extracted, but the presence of Auto_Open and dangerous functions strongly suggests a malicious intent to execute arbitrary code.

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) 6654 bytes
SHA-256: b603ad32bd3f14330604e6652c59e7b26bd0fa5022157043784672792dc83618
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 -  iizS
' 0018     27 LABEL : Cell Value, String Constant - ANbkGETEdnmo len=0 
' 0018     27 LABEL : Cell Value, String Constant - aNJTsVmmDPwZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G173 
' 0018     26 LABEL : Cell Value, String Constant - BSaKMdhFdvI len=0 
' 0018     22 LABEL : Cell Value, String Constant - cAzxBnX len=0 
' 0018     27 LABEL : Cell Value, String Constant - djuSpWnmDoWu len=0 
' 0018     22 LABEL : Cell Value, String Constant - fKxGvYu len=0 
' 0018     25 LABEL : Cell Value, String Constant - FtFRtcksuT len=0 
' 0018     27 LABEL : Cell Value, String Constant - igPmpBNObUGJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - jKvSJkpOc len=0 
' 0018     26 LABEL : Cell Value, String Constant - KNfsEXgtEtk len=0 
' 0018     27 LABEL : Cell Value, String Constant - mUrAQbxkXPmt len=0 
' 0018     21 LABEL : Cell Value, String Constant - PPgOIY len=0 
' 0018     23 LABEL : Cell Value, String Constant - SpdZtSUv len=0 
' 0018     27 LABEL : Cell Value, String Constant - TAxNjbsvRpgY len=0 
' 0018     20 LABEL : Cell Value, String Constant - vaNCq len=0 
' 0018     26 LABEL : Cell Value, String Constant - wQeQZlIrMqh len=0 
' 0018     21 LABEL : Cell Value, String Constant - WuXmUC len=0 
' 0018     20 LABEL : Cell Value, String Constant - xIvZU len=0 
' 0018     25 LABEL : Cell Value, String Constant - xmvmzEbPRH len=0 
' 0018     25 LABEL : Cell Value, String Constant - yYgDEtzbWs 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
... (truncated)

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