Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6c07e763327b196e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:35:00 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 3f39d51631b7e4b19368c0d5bf4d58ce SHA-1: 650eceacabbbf99768afb0be308a14613ef6c377 SHA-256: 6c07e763327b196ef0176c81442c403b716ff8ee8d75635be44c88e5fa753268
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open function. This function is designed to automatically execute when the workbook is opened, indicating an attempt to run malicious code. The presence of dangerous formula APIs like RUN further supports the 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) 6636 bytes
SHA-256: 8d39c0103dd4c645c982253f2e1621e453590c9773e83ff1b6d1a578c0e7440f
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 -  JXBqKdLxMAm
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E156 
' 0018     20 LABEL : Cell Value, String Constant - ddfkF len=0 
' 0018     25 LABEL : Cell Value, String Constant - eFQeZaHfGr len=0 
' 0018     27 LABEL : Cell Value, String Constant - hNqdLxyUylJv len=0 
' 0018     20 LABEL : Cell Value, String Constant - huTin len=0 
' 0018     21 LABEL : Cell Value, String Constant - jBIVRq len=0 
' 0018     25 LABEL : Cell Value, String Constant - jDfpXcRkBf len=0 
' 0018     21 LABEL : Cell Value, String Constant - KlunbM len=0 
' 0018     27 LABEL : Cell Value, String Constant - mciNcYueJkJH len=0 
' 0018     26 LABEL : Cell Value, String Constant - mlNpcuqPXpH len=0 
' 0018     26 LABEL : Cell Value, String Constant - MZAibnEuWYD len=0 
' 0018     21 LABEL : Cell Value, String Constant - OFTXiu len=0 
' 0018     27 LABEL : Cell Value, String Constant - QhTzVbCgAvst len=0 
' 0018     20 LABEL : Cell Value, String Constant - qXHlE len=0 
' 0018     24 LABEL : Cell Value, String Constant - sHpeEZKPN len=0 
' 0018     24 LABEL : Cell Value, String Constant - UeWalnIKo len=0 
' 0018     25 LABEL : Cell Value, String Constant - VbYLaDzbbB len=0 
' 0018     25 LABEL : Cell Value, String Constant - vLDTBpbpiL len=0 
' 0018     20 LABEL : Cell Value, String Constant - vuxBK len=0 
' 0018     20 LABEL : Cell Value, String Constant - zdeCo len=0 
' 0018     25 LABEL : Cell Value, String Constant - zgMtZcHJYy 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)

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