Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 848b5c974ee6bcb4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:36 Authoring application: Microsoft Excel First seen: 2021-09-15
MD5: 46d8291b853662c110cfc2a3b9078ced SHA-1: 9fc12143dba18cf69550d0f079b1962d7e272005 SHA-256: 848b5c974ee6bcb4721016e1d2f52697f4863b13b630039f92ebe90849434ad1
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known technique for executing malicious code. The presence of dangerous formula APIs like RUN in the Auto_Open macro indicates an intent to run arbitrary commands. This suggests the file is likely a malicious document delivered via spearphishing, designed to execute a payload when opened.

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) 6671 bytes
SHA-256: 14d558090e0f114a31ea98d9d8b4952866eabb4741bef7cee4c62929ec0d8e72
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  umBcFQaIkJB
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E203 
' 0018     25 LABEL : Cell Value, String Constant - aWzNLcxkmu len=0 
' 0018     20 LABEL : Cell Value, String Constant - cnvwN len=0 
' 0018     22 LABEL : Cell Value, String Constant - COUodVo len=0 
' 0018     27 LABEL : Cell Value, String Constant - dGzslKJxwUdv len=0 
' 0018     25 LABEL : Cell Value, String Constant - eCqLVrFMjz len=0 
' 0018     23 LABEL : Cell Value, String Constant - Ekgpyokq len=0 
' 0018     24 LABEL : Cell Value, String Constant - FhfynJHpU len=0 
' 0018     22 LABEL : Cell Value, String Constant - InfJDIL len=0 
' 0018     22 LABEL : Cell Value, String Constant - JGPsXUY len=0 
' 0018     27 LABEL : Cell Value, String Constant - jLZdlqPhwyPW len=0 
' 0018     23 LABEL : Cell Value, String Constant - MxQePkjj len=0 
' 0018     27 LABEL : Cell Value, String Constant - NAHghqWHBatK len=0 
' 0018     23 LABEL : Cell Value, String Constant - nayXTinf len=0 
' 0018     21 LABEL : Cell Value, String Constant - NrARUa len=0 
' 0018     21 LABEL : Cell Value, String Constant - ohbDnD len=0 
' 0018     20 LABEL : Cell Value, String Constant - sLUzJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - VvsKeN len=0 
' 0018     20 LABEL : Cell Value, String Constant - wcNsG len=0 
' 0018     22 LABEL : Cell Value, String Constant - XXWSdkw len=0 
' 0018     23 LABEL : Cell Value, String Constant - zexVXdWL 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 LAB
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.