Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d3b3e81c46bd4d54…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:45:23 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 7ee9341cc72a7e6aaf48ab67c7cab827 SHA-1: d5591a4771c610f151c2de2b5475b3a50311cc01 SHA-256: d3b3e81c46bd4d54d5dfa88d1860a3946a0a41bb3cd6baafd03bf46e825fb90c
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 defined name, which is a critical finding indicating potential malicious execution. The presence of dangerous formula APIs like RUN further suggests that the macro is designed to execute arbitrary code. This is a common technique for delivering secondary payloads, hence the high confidence in an attack pattern involving code execution.

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) 6371 bytes
SHA-256: 07783ccfc43d876a5aa624eb570bfbc87ee801b39de93861a5d0231525ab87e8
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 -  MxIe
' 0018     26 LABEL : Cell Value, String Constant - ahTDxjyQAKG len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I152 
' 0018     23 LABEL : Cell Value, String Constant - awQyjPOZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - cEOlysH len=0 
' 0018     22 LABEL : Cell Value, String Constant - DgYlsDI len=0 
' 0018     22 LABEL : Cell Value, String Constant - dIquKlf len=0 
' 0018     22 LABEL : Cell Value, String Constant - drttCdl len=0 
' 0018     24 LABEL : Cell Value, String Constant - eSwvGlPsV len=0 
' 0018     22 LABEL : Cell Value, String Constant - FYsojGM len=0 
' 0018     20 LABEL : Cell Value, String Constant - gJdmQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - iMRMufeuZfU len=0 
' 0018     25 LABEL : Cell Value, String Constant - ItkQrOdKZq len=0 
' 0018     22 LABEL : Cell Value, String Constant - khoLzNT len=0 
' 0018     25 LABEL : Cell Value, String Constant - KhzAVfCyAw len=0 
' 0018     20 LABEL : Cell Value, String Constant - nBofT len=0 
' 0018     22 LABEL : Cell Value, String Constant - ooELbeM len=0 
' 0018     22 LABEL : Cell Value, String Constant - SJYQjSX len=0 
' 0018     26 LABEL : Cell Value, String Constant - WukrgTwxFsu len=0 
' 0018     26 LABEL : Cell Value, String Constant - yCvEmyYxywr len=0 
' 0018     20 LABEL : Cell Value, String Constant - yNbCb len=0 
' 0018     21 LABEL : Cell Value, String Constant - zmutfl 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     10 LABELSST :
... (truncated)

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