Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6075fc4eb77c6e12…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:40:27 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 2cccafee55bafcb9d9b948118b15d0be SHA-1: 00be4c48acb0be12f0a215ed7f8dfb302d0f6254 SHA-256: 6075fc4eb77c6e12f48efec4441096e6ce20b5a8c6649f1423f25e0bc762ca2e
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-enabled workbook containing an Auto_Open function, which is a critical indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely downloading and running a second-stage payload. No specific IOCs were extracted, but the Auto_Open technique is highly suspicious.

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) 6887 bytes
SHA-256: dcdcd93186e298ed5d0ffdb84753d7c6469a629bb4b6bd20d6f42f30b367de0f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  aZotHFsGHxY
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H158 
' 0018     23 LABEL : Cell Value, String Constant - BiNKlJCc len=0 
' 0018     26 LABEL : Cell Value, String Constant - BLiYFoEHqyY len=0 
' 0018     24 LABEL : Cell Value, String Constant - CNjTJyeMO len=0 
' 0018     22 LABEL : Cell Value, String Constant - ffpfJHU len=0 
' 0018     22 LABEL : Cell Value, String Constant - fuEBcLg len=0 
' 0018     23 LABEL : Cell Value, String Constant - HDNKJJeE len=0 
' 0018     25 LABEL : Cell Value, String Constant - jABmhMchpO len=0 
' 0018     23 LABEL : Cell Value, String Constant - jCJEEStY len=0 
' 0018     21 LABEL : Cell Value, String Constant - jdhUMn len=0 
' 0018     25 LABEL : Cell Value, String Constant - opELNJZFVl len=0 
' 0018     20 LABEL : Cell Value, String Constant - pTQEO len=0 
' 0018     25 LABEL : Cell Value, String Constant - QLPwJJVUEy len=0 
' 0018     23 LABEL : Cell Value, String Constant - rkpYvQjA len=0 
' 0018     27 LABEL : Cell Value, String Constant - sYeLAzTRuROL len=0 
' 0018     26 LABEL : Cell Value, String Constant - THChuVbJfvM len=0 
' 0018     26 LABEL : Cell Value, String Constant - UWUXQlkVOGw len=0 
' 0018     23 LABEL : Cell Value, String Constant - UyMgBewa len=0 
' 0018     22 LABEL : Cell Value, String Constant - VZqsIdn len=0 
' 0018     24 LABEL : Cell Value, String Constant - xDrhIDBfI len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZsMnixZFC 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
'
... (truncated)

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