Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0b44db9e5a245e78…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:49 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: e3810bc91647ec62ef9956396246f0f7 SHA-1: 173e9d185a1cd034b44714af3c14b2fa4aaa3061 SHA-256: 0b44db9e5a245e78535ef372c65c89c60cb039bb986cb704eaeb6090d013e87b
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 point, which is a known method for executing malicious code. The macro sheet contains a reference to a dangerous function, likely for code execution. Although no specific URLs or hashes were extracted, the presence of Auto_Open strongly suggests the file is designed to download and execute a secondary 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) 6593 bytes
SHA-256: d1a7ddb1a127fadd1c514102587ba891ff05a3ddd4829d6c645026ecafd5e7b3
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 -  MOrNTGrXiOZ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D148 
' 0018     20 LABEL : Cell Value, String Constant - BaDzZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - ETEmrWY len=0 
' 0018     24 LABEL : Cell Value, String Constant - FaCscrdKm len=0 
' 0018     20 LABEL : Cell Value, String Constant - fedpe len=0 
' 0018     24 LABEL : Cell Value, String Constant - FIySQTyef len=0 
' 0018     25 LABEL : Cell Value, String Constant - GbqHUAbKGD len=0 
' 0018     25 LABEL : Cell Value, String Constant - hFBHVIQVeU len=0 
' 0018     23 LABEL : Cell Value, String Constant - iRajLUOC len=0 
' 0018     20 LABEL : Cell Value, String Constant - jlibG len=0 
' 0018     21 LABEL : Cell Value, String Constant - KNgzjP len=0 
' 0018     22 LABEL : Cell Value, String Constant - kpNBrWA len=0 
' 0018     24 LABEL : Cell Value, String Constant - miPEqlljB len=0 
' 0018     27 LABEL : Cell Value, String Constant - nIEJvMPvsEUA len=0 
' 0018     23 LABEL : Cell Value, String Constant - NIIZwouy len=0 
' 0018     23 LABEL : Cell Value, String Constant - OiPKRyPN len=0 
' 0018     24 LABEL : Cell Value, String Constant - rOOjEjgdt len=0 
' 0018     24 LABEL : Cell Value, String Constant - rtXEEYvlG len=0 
' 0018     22 LABEL : Cell Value, String Constant - UfsdOae len=0 
' 0018     24 LABEL : Cell Value, String Constant - ujnzMiTgk len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZjCxb 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 LABE
... (truncated)

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