Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8ff3615966b45803…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-25 10:44:29 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 341d5c4ca5ff4fb64ea35c41e8a6dd97 SHA-1: 59791e7afe687fe6def417a4b77dfbc753ff07da SHA-256: 8ff3615966b45803b21953abebc7c2766419e24d5185b18ad0d7c76e54855093
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 sheet containing an Auto_Open defined name, indicating it will execute automatically upon opening. The presence of dangerous formula APIs, specifically 'RUN=0', suggests the macro is designed to run arbitrary commands. No specific family could be identified, and no external IOCs were extracted.

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) 6619 bytes
SHA-256: f6656f79ba4eface28f58a218adfef540daffdcd42032cb881a509b24717ec29
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xscqcvE
' 0018     24 LABEL : Cell Value, String Constant - aRIEAYOYg len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F158 
' 0018     22 LABEL : Cell Value, String Constant - BihzGMe len=0 
' 0018     23 LABEL : Cell Value, String Constant - bmkUgmmG len=0 
' 0018     27 LABEL : Cell Value, String Constant - DgFZjEKxqcPw len=0 
' 0018     23 LABEL : Cell Value, String Constant - EQBQYmbq len=0 
' 0018     20 LABEL : Cell Value, String Constant - ExZFt len=0 
' 0018     20 LABEL : Cell Value, String Constant - HfXqv len=0 
' 0018     24 LABEL : Cell Value, String Constant - HqMZByYdr len=0 
' 0018     24 LABEL : Cell Value, String Constant - iOiLjBZcP len=0 
' 0018     27 LABEL : Cell Value, String Constant - jddXJkgVhBvk len=0 
' 0018     20 LABEL : Cell Value, String Constant - LhlVB len=0 
' 0018     27 LABEL : Cell Value, String Constant - lYUoJaISieQR len=0 
' 0018     23 LABEL : Cell Value, String Constant - MdtsxiIA len=0 
' 0018     23 LABEL : Cell Value, String Constant - msWiGCtJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - oJaGCQGbH len=0 
' 0018     23 LABEL : Cell Value, String Constant - rAfVIFLX len=0 
' 0018     23 LABEL : Cell Value, String Constant - SqWCdBHL len=0 
' 0018     27 LABEL : Cell Value, String Constant - TlPRHykBBXAt len=0 
' 0018     23 LABEL : Cell Value, String Constant - WjKGTAID len=0 
' 0018     24 LABEL : Cell Value, String Constant - xedHZhJcl 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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