Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9c94241633a42744…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:48 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: cd3bcf2a14a88ae3502c4a8f3c767fcb SHA-1: a8c74289ba23d52ddecb1bbe42ace682005566c0 SHA-256: 9c94241633a42744ce71bd93bb21761671ef5c4935b2fa30b7523ccb9e91143d
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open macro, which is a critical finding. This indicates the file is designed to automatically execute code upon opening. The presence of dangerous formula APIs like RUN suggests the macro is intended to download and execute a second-stage payload. No specific family could be identified.

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) 6566 bytes
SHA-256: f54911c41dfae8271eafad0b9f272960050d5247591a3fd08bcb4e7eb271d76d
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 -  tNUSVJDfZ
' 0018     27 LABEL : Cell Value, String Constant - apdIxpIHbdGU len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E184 
' 0018     27 LABEL : Cell Value, String Constant - bbTRnTdRLNJJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - DhLzGZtcV len=0 
' 0018     23 LABEL : Cell Value, String Constant - FXnmUVCs len=0 
' 0018     27 LABEL : Cell Value, String Constant - fzozDjSWFqTN len=0 
' 0018     21 LABEL : Cell Value, String Constant - GAAoUT len=0 
' 0018     20 LABEL : Cell Value, String Constant - GlXzA len=0 
' 0018     23 LABEL : Cell Value, String Constant - goiCzpAp len=0 
' 0018     23 LABEL : Cell Value, String Constant - hiCKUhUs len=0 
' 0018     21 LABEL : Cell Value, String Constant - JPRpvk len=0 
' 0018     23 LABEL : Cell Value, String Constant - kUFFNtzg len=0 
' 0018     20 LABEL : Cell Value, String Constant - NEzrx len=0 
' 0018     23 LABEL : Cell Value, String Constant - RsodwEgX len=0 
' 0018     25 LABEL : Cell Value, String Constant - tCAomYKGQd len=0 
' 0018     23 LABEL : Cell Value, String Constant - TNocLmmK len=0 
' 0018     26 LABEL : Cell Value, String Constant - vxUsTovWiIq len=0 
' 0018     21 LABEL : Cell Value, String Constant - wJUpjW len=0 
' 0018     22 LABEL : Cell Value, String Constant - yEuHxte len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZHeQTKdd len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZhNoiWyFvNW 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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