Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1c17725e7cdd7231…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:33 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 3b504d6ae056962f6a84194b69ef14f6 SHA-1: 798edad03f55ca4e37c8fb6c445d0d5c8b2948a0 SHA-256: 1c17725e7cdd72319b985e15d096f3059424049a611122be0d44b1b58426f6a5
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) 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) 6585 bytes
SHA-256: dc0a720a875121999ad8d8c7bb526eefe697675d53015c03b2f21a798c7aa23d
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 -  NzvddiU
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C187 
' 0018     24 LABEL : Cell Value, String Constant - BKNlLsDqG len=0 
' 0018     25 LABEL : Cell Value, String Constant - DbhYlDnVOs len=0 
' 0018     24 LABEL : Cell Value, String Constant - dOoSidZxJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - DSlDegXkjhY len=0 
' 0018     27 LABEL : Cell Value, String Constant - FzdcquSYigEu len=0 
' 0018     22 LABEL : Cell Value, String Constant - iOtvSkC len=0 
' 0018     25 LABEL : Cell Value, String Constant - jivQjCYeju len=0 
' 0018     23 LABEL : Cell Value, String Constant - jYZPRpTA len=0 
' 0018     27 LABEL : Cell Value, String Constant - LUQiqPUHRuPK len=0 
' 0018     22 LABEL : Cell Value, String Constant - MalCxRK len=0 
' 0018     23 LABEL : Cell Value, String Constant - NEzLYfPa len=0 
' 0018     20 LABEL : Cell Value, String Constant - nGNOg len=0 
' 0018     26 LABEL : Cell Value, String Constant - piVFejZPErB len=0 
' 0018     22 LABEL : Cell Value, String Constant - POjobLC len=0 
' 0018     21 LABEL : Cell Value, String Constant - QAIcHB len=0 
' 0018     26 LABEL : Cell Value, String Constant - QBAxXUPuELg len=0 
' 0018     24 LABEL : Cell Value, String Constant - RdNcXILtb len=0 
' 0018     23 LABEL : Cell Value, String Constant - SQvGscGx len=0 
' 0018     21 LABEL : Cell Value, String Constant - wYSsbA len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZDxtrwyo 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
' 00f
... (truncated)

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