Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f19e99e41b1834c0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:51 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 769bac2abeb290b3696b71cdd4bd5504 SHA-1: 63094246c8ee19d3a1556521dd18994276a1986d SHA-256: f19e99e41b1834c03c1c4ae4ab5e8936e0407b4433f5071fff8b70ef9c552613
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 defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN further confirms the intent to execute arbitrary commands. This suggests a macro-based execution attack, 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) 6640 bytes
SHA-256: 9507075a27d01f34850273e54bba1f52646a37ac177264ae320e40fb7435327d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  FNJeMQYVi
' 0018     27 LABEL : Cell Value, String Constant - aEoOZGokPHWb len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B146 
' 0018     26 LABEL : Cell Value, String Constant - BszcPUBvZWM len=0 
' 0018     25 LABEL : Cell Value, String Constant - CbMPGIKPYW len=0 
' 0018     20 LABEL : Cell Value, String Constant - DnrHR len=0 
' 0018     23 LABEL : Cell Value, String Constant - FPSdxBmU len=0 
' 0018     22 LABEL : Cell Value, String Constant - gDlOkUO len=0 
' 0018     23 LABEL : Cell Value, String Constant - GDWnqlwH len=0 
' 0018     20 LABEL : Cell Value, String Constant - Haeml len=0 
' 0018     22 LABEL : Cell Value, String Constant - HnqBuKD len=0 
' 0018     25 LABEL : Cell Value, String Constant - HRjhuBpMBw len=0 
' 0018     22 LABEL : Cell Value, String Constant - OEHtyHL len=0 
' 0018     24 LABEL : Cell Value, String Constant - oHhuMqPHu len=0 
' 0018     20 LABEL : Cell Value, String Constant - PRFik len=0 
' 0018     26 LABEL : Cell Value, String Constant - qEAYOuGkovT len=0 
' 0018     21 LABEL : Cell Value, String Constant - qvLQcC len=0 
' 0018     26 LABEL : Cell Value, String Constant - SBYyurGncBE len=0 
' 0018     24 LABEL : Cell Value, String Constant - UzLGVCUyX len=0 
' 0018     25 LABEL : Cell Value, String Constant - uzyaMoWQsO len=0 
' 0018     24 LABEL : Cell Value, String Constant - VFdibMCpW len=0 
' 0018     24 LABEL : Cell Value, String Constant - yiBSXMExU 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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