Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 360237168b144f0f…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:39:29 Authoring application: Microsoft Excel First seen: 2021-09-25
MD5: 3817c674cd89056e74b4cdfa3f1d6e38 SHA-1: 09ac4f1987a75499bc0aff2c3687701565440998 SHA-256: 360237168b144f0ff2da805ecb593208c298343bf7a853308a6f5153fc0b69b0
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. Heuristics indicate the presence of an Auto_Open defined name, which is a common technique for executing malicious code upon opening the workbook. The macro sheet contains dangerous formula APIs, including a RUN function, suggesting it is designed to execute a payload. No specific URLs or hashes were extracted, but the presence of the Auto_Open macro strongly implies a downloader or initial execution stage.

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) 6592 bytes
SHA-256: 63310460943283a74a6912e0924829b78a077154efeeb87b6a03f81f948acf19
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  QpCvxia
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G181 
' 0018     24 LABEL : Cell Value, String Constant - btcgSgQZF len=0 
' 0018     21 LABEL : Cell Value, String Constant - BxeHfP len=0 
' 0018     23 LABEL : Cell Value, String Constant - DoplEjOy len=0 
' 0018     20 LABEL : Cell Value, String Constant - HryLV len=0 
' 0018     20 LABEL : Cell Value, String Constant - HsDpf len=0 
' 0018     23 LABEL : Cell Value, String Constant - hzHTwTYd len=0 
' 0018     22 LABEL : Cell Value, String Constant - iMyeUtY len=0 
' 0018     23 LABEL : Cell Value, String Constant - jegWIWAQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - jUQpVTX len=0 
' 0018     20 LABEL : Cell Value, String Constant - kGOOY len=0 
' 0018     25 LABEL : Cell Value, String Constant - NhVTdvStLI len=0 
' 0018     23 LABEL : Cell Value, String Constant - nPuQnxGu len=0 
' 0018     22 LABEL : Cell Value, String Constant - ONAXvUj len=0 
' 0018     26 LABEL : Cell Value, String Constant - PmkWvOPQBas len=0 
' 0018     23 LABEL : Cell Value, String Constant - rtbmAcSn len=0 
' 0018     27 LABEL : Cell Value, String Constant - VrbuSfmnnqkW len=0 
' 0018     24 LABEL : Cell Value, String Constant - xqhuCpNiH len=0 
' 0018     22 LABEL : Cell Value, String Constant - yqOLxHE len=0 
' 0018     22 LABEL : Cell Value, String Constant - zhIaUwW len=0 
' 0018     22 LABEL : Cell Value, String Constant - zieESxK 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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