Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9297b46fee5b0176…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:46 Authoring application: Microsoft Excel First seen: 2021-05-23
MD5: 2d9b1238efc1312cbf0a9625f7ce8c0a SHA-1: 30e26abd09b3356e9d8303c53b8b3eb34aff4741 SHA-256: 9297b46fee5b01763c9006d57261372287f1d573a37eac1d206f953c519dce06
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a known method for executing malicious code. The macro sheet contains a reference to 'Auto_Open', suggesting it will run automatically upon opening the workbook. The presence of dangerous formula APIs further supports malicious intent, likely to download and execute 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) 6646 bytes
SHA-256: e3bced42b685c50dfe9d5ea8019c712a93529bee7c1b108a1c907f00a88aca10
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 -  EdSf
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D141 
' 0018     22 LABEL : Cell Value, String Constant - bbCbsIk len=0 
' 0018     27 LABEL : Cell Value, String Constant - bbRodmpSvrIM len=0 
' 0018     24 LABEL : Cell Value, String Constant - BiDzZwXrg len=0 
' 0018     21 LABEL : Cell Value, String Constant - BXItbs len=0 
' 0018     25 LABEL : Cell Value, String Constant - DrtzBUAXgy len=0 
' 0018     25 LABEL : Cell Value, String Constant - epiLXfqjHz len=0 
' 0018     24 LABEL : Cell Value, String Constant - eQXziSpuY len=0 
' 0018     23 LABEL : Cell Value, String Constant - ioGzQuTD len=0 
' 0018     25 LABEL : Cell Value, String Constant - IrUSKyWSTM len=0 
' 0018     27 LABEL : Cell Value, String Constant - MAOZTggympej len=0 
' 0018     22 LABEL : Cell Value, String Constant - NnzJNyG len=0 
' 0018     22 LABEL : Cell Value, String Constant - olAnjrn len=0 
' 0018     27 LABEL : Cell Value, String Constant - rdEFdEvfrDzk len=0 
' 0018     22 LABEL : Cell Value, String Constant - RnLjhnA len=0 
' 0018     23 LABEL : Cell Value, String Constant - SRnYVapb len=0 
' 0018     25 LABEL : Cell Value, String Constant - TLnoddNumx len=0 
' 0018     21 LABEL : Cell Value, String Constant - wBCRis len=0 
' 0018     25 LABEL : Cell Value, String Constant - wzmWyyTOfM len=0 
' 0018     21 LABEL : Cell Value, String Constant - xspPme len=0 
' 0018     20 LABEL : Cell Value, String Constant - ybmQQ 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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