Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 23dd6d38cb17d682…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:20 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 4551790938e8aff60b98f71f4319edd2 SHA-1: 7c344c4b5d11a22424778287826828ccc2adf14e SHA-256: 23dd6d38cb17d6822a39bccfec541fd4bbf5b5b2850b1b1888c18c2be6e626b2
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 function, which is a known method for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands, likely to download and run a second-stage payload.

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) 6480 bytes
SHA-256: 9143504ae277fa66b51d294e90c07d68a495c7c3abfdaf41a9cf56c2b8bbd72e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  UShKjy
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A170 
' 0018     27 LABEL : Cell Value, String Constant - cCocRZDUkpjf len=0 
' 0018     24 LABEL : Cell Value, String Constant - CYplNZYug len=0 
' 0018     27 LABEL : Cell Value, String Constant - DftFgWDbLNPa len=0 
' 0018     24 LABEL : Cell Value, String Constant - EKvpPUOLf len=0 
' 0018     21 LABEL : Cell Value, String Constant - EuPLhA len=0 
' 0018     21 LABEL : Cell Value, String Constant - gmSxUQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - hmpxbVfs len=0 
' 0018     22 LABEL : Cell Value, String Constant - KSNZfqS len=0 
' 0018     25 LABEL : Cell Value, String Constant - lZLpUqmIRR len=0 
' 0018     27 LABEL : Cell Value, String Constant - mELoHkxuwGmN len=0 
' 0018     24 LABEL : Cell Value, String Constant - NJQomrAtK len=0 
' 0018     23 LABEL : Cell Value, String Constant - orkizQEn len=0 
' 0018     25 LABEL : Cell Value, String Constant - SmWeKiuaIW len=0 
' 0018     21 LABEL : Cell Value, String Constant - sWfLrn len=0 
' 0018     20 LABEL : Cell Value, String Constant - tiGqZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - VEeFOnXePaB len=0 
' 0018     27 LABEL : Cell Value, String Constant - WmLPqAccpoYt len=0 
' 0018     21 LABEL : Cell Value, String Constant - yRlUEl len=0 
' 0018     23 LABEL : Cell Value, String Constant - zpjJfYug len=0 
' 0018     21 LABEL : Cell Value, String Constant - zqhWSm 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  
... (truncated)

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