Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4715590d8bb21e1e…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:40:37 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 3266af2444f7f1fd7655cebdc3702044 SHA-1: 6b8bccad9123f4d6a3c4eb41cedb269c07aa8bc5 SHA-256: 4715590d8bb21e1e546eb9c82faa742749b75f514cc56c331d2bf2a232de2e1f
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open function, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely downloading and running a second-stage payload. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro itself.

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) 6538 bytes
SHA-256: c5069d1902c174c706aa545ebd5221f3d5ed11a0bcffec868aeb36939e4ffcbe
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  iCzFd
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H126 
' 0018     22 LABEL : Cell Value, String Constant - Bgcngac len=0 
' 0018     26 LABEL : Cell Value, String Constant - ByNvFXrWCHx len=0 
' 0018     27 LABEL : Cell Value, String Constant - cyGkqWrEEUXk len=0 
' 0018     24 LABEL : Cell Value, String Constant - DGBauKRQR len=0 
' 0018     20 LABEL : Cell Value, String Constant - fLFtT len=0 
' 0018     23 LABEL : Cell Value, String Constant - HduXLOCQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - jjstqzksXYy len=0 
' 0018     25 LABEL : Cell Value, String Constant - mHBexzcZKK len=0 
' 0018     25 LABEL : Cell Value, String Constant - noDmVZlUMF len=0 
' 0018     23 LABEL : Cell Value, String Constant - NTSqHXYh len=0 
' 0018     25 LABEL : Cell Value, String Constant - OAMZktarOE len=0 
' 0018     22 LABEL : Cell Value, String Constant - oOVvEKe len=0 
' 0018     22 LABEL : Cell Value, String Constant - OuxywLh len=0 
' 0018     22 LABEL : Cell Value, String Constant - OZGtTDs len=0 
' 0018     20 LABEL : Cell Value, String Constant - rHVLX len=0 
' 0018     22 LABEL : Cell Value, String Constant - sYSJLRG len=0 
' 0018     20 LABEL : Cell Value, String Constant - vzjQb len=0 
' 0018     25 LABEL : Cell Value, String Constant - WoLLogugaH len=0 
' 0018     23 LABEL : Cell Value, String Constant - xuxzrtuh len=0 
' 0018     23 LABEL : Cell Value, String Constant - zZNvrBIe 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 LA
... (truncated)

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