Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5feefb18b7402382…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:29 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 173dd7371ad30d1e60642fc1741230f8 SHA-1: 3632b27ecca5411a90784595d7bc089e2224752f SHA-256: 5feefb18b7402382fabd21b3450f216cf74d4ed66c465441a828236f91fcf8a1
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 indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands or download further payloads. Without explicit URLs or further script content, the exact payload and delivery mechanism remain unknown, but the execution vector is clear.

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) 6436 bytes
SHA-256: ab03cd892356af66b799003bae135fa8ecd04554e8a35b06182650b4d5be4b2d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  oKDb
' 0018     21 LABEL : Cell Value, String Constant - AEbQsJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - aJPDxujqi len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I172 
' 0018     22 LABEL : Cell Value, String Constant - ewKbxZj len=0 
' 0018     21 LABEL : Cell Value, String Constant - FjbOAs len=0 
' 0018     23 LABEL : Cell Value, String Constant - fzKNjRih len=0 
' 0018     21 LABEL : Cell Value, String Constant - HgXbtH len=0 
' 0018     23 LABEL : Cell Value, String Constant - hxTRDkCf len=0 
' 0018     22 LABEL : Cell Value, String Constant - iQKMTIn len=0 
' 0018     24 LABEL : Cell Value, String Constant - mBlhiPXRv len=0 
' 0018     26 LABEL : Cell Value, String Constant - NLFVliYNhFa len=0 
' 0018     23 LABEL : Cell Value, String Constant - NTmeUDPl len=0 
' 0018     26 LABEL : Cell Value, String Constant - oWQrEuQriEF len=0 
' 0018     21 LABEL : Cell Value, String Constant - PzrQUh len=0 
' 0018     27 LABEL : Cell Value, String Constant - QDyrMQvbaiZo len=0 
' 0018     24 LABEL : Cell Value, String Constant - vAhJKJkze len=0 
' 0018     25 LABEL : Cell Value, String Constant - vglAkMcpCQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - VJKKyg len=0 
' 0018     23 LABEL : Cell Value, String Constant - vrZYweSG len=0 
' 0018     20 LABEL : Cell Value, String Constant - Webuk len=0 
' 0018     24 LABEL : Cell Value, String Constant - XyzKEqZEN 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 LABELSS
... (truncated)

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