Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4ee28d20ec4106a2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:37:58 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 99c36b6dc24a9843f091b6ab0d17ef05 SHA-1: 1930fcb2413376aae21c838a47454ccd242bc983 SHA-256: 4ee28d20ec4106a225d07724d320c294bb85e4942f5d027b79bacfffc56a0c93
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 macros, specifically an Auto_Open function. This function is designed to execute automatically when the workbook is opened, indicating an attempt to run arbitrary code. The presence of dangerous formula APIs further suggests malicious intent, likely to download and execute a second-stage payload.

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) 6829 bytes
SHA-256: f99def5a335fb045759899af1f8e91e29ba89099960470c84557494721ae4be6
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 -  fFQUvhryn
' 0018     23 LABEL : Cell Value, String Constant - AbhCnhav len=0 
' 0018     26 LABEL : Cell Value, String Constant - ACQlCKwUmTC len=0 
' 0018     24 LABEL : Cell Value, String Constant - aEoixfsmW len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H198 
' 0018     26 LABEL : Cell Value, String Constant - AxfkTBYkoJq len=0 
' 0018     27 LABEL : Cell Value, String Constant - BGaLDIaGLsOA len=0 
' 0018     26 LABEL : Cell Value, String Constant - FjVWnLOxVms len=0 
' 0018     24 LABEL : Cell Value, String Constant - flkbHsaYg len=0 
' 0018     26 LABEL : Cell Value, String Constant - FywUjLbDhuA len=0 
' 0018     22 LABEL : Cell Value, String Constant - IyiAAHT len=0 
' 0018     23 LABEL : Cell Value, String Constant - jGBxldhS len=0 
' 0018     22 LABEL : Cell Value, String Constant - LRhHTaJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - MSQqfpzErmg len=0 
' 0018     22 LABEL : Cell Value, String Constant - nLjWOOL len=0 
' 0018     23 LABEL : Cell Value, String Constant - OcdGAqow len=0 
' 0018     21 LABEL : Cell Value, String Constant - OiXuHw len=0 
' 0018     23 LABEL : Cell Value, String Constant - OmoKxMqR len=0 
' 0018     22 LABEL : Cell Value, String Constant - spYqiwx len=0 
' 0018     24 LABEL : Cell Value, String Constant - VaMztGMsu len=0 
' 0018     27 LABEL : Cell Value, String Constant - vpazCVObaofx len=0 
' 0018     26 LABEL : Cell Value, String Constant - xVPFxQaSepc 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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