Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 32b228f50ce0afc8…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:26:30 Authoring application: Microsoft Excel First seen: 2021-05-23
MD5: 8e216870fa5b4b6bd629ecc2d367c9d6 SHA-1: d23ae5875768edf05f4157ee919bcbc87d7b3182 SHA-256: 32b228f50ce0afc8aaaffa082d055196b4e097c2c6f7d1ab962f99f11b0cc009
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 macro, which is a critical finding. This indicates the file is designed to automatically execute code upon opening. The presence of dangerous formula APIs like RUN suggests the macro is intended to download and execute a secondary payload, a common technique for malware delivery.

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) 6632 bytes
SHA-256: d6d1b8483b8ded4d3f023eb1032d350574ecb3ead255b34ef473b800ed2d686b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  UUTFZtHSNJ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H147 
' 0018     25 LABEL : Cell Value, String Constant - BctwbzpwxV len=0 
' 0018     22 LABEL : Cell Value, String Constant - bKSxEcb len=0 
' 0018     22 LABEL : Cell Value, String Constant - byVbQgz len=0 
' 0018     26 LABEL : Cell Value, String Constant - DNqmOfUNXgN len=0 
' 0018     22 LABEL : Cell Value, String Constant - erKCgVL len=0 
' 0018     24 LABEL : Cell Value, String Constant - ErXgDtOgj len=0 
' 0018     20 LABEL : Cell Value, String Constant - gRoFp len=0 
' 0018     24 LABEL : Cell Value, String Constant - hNVquKvTJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - jRHjcpKfuXp len=0 
' 0018     25 LABEL : Cell Value, String Constant - knGHEKXolZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - mormxbgVjnV len=0 
' 0018     23 LABEL : Cell Value, String Constant - NAIxwbKm len=0 
' 0018     23 LABEL : Cell Value, String Constant - qaBvhlFa len=0 
' 0018     27 LABEL : Cell Value, String Constant - rxjCbzxbpczk len=0 
' 0018     25 LABEL : Cell Value, String Constant - RySvvPdnDL len=0 
' 0018     25 LABEL : Cell Value, String Constant - TwkJxTBjQz len=0 
' 0018     26 LABEL : Cell Value, String Constant - uEnFNaQocAP len=0 
' 0018     21 LABEL : Cell Value, String Constant - VhPLMk len=0 
' 0018     22 LABEL : Cell Value, String Constant - wNkjjhe len=0 
' 0018     25 LABEL : Cell Value, String Constant - zbMyzBtzAJ 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/ S
... (truncated)

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