Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8673c1932791982c…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-27 11:44:09 Authoring application: Microsoft Excel First seen: 2021-10-04
MD5: 312d99d28dfa61c530095da123f1315a SHA-1: f96bd1aaeb17a861ee848176f07be24afa0faa9e SHA-256: 8673c1932791982c14f11e753f6c8a6d5e702818244c5381f3053179d03381cf
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 finding. This indicates the macro will execute automatically upon opening the workbook. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands, likely to download and run a secondary 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) 6862 bytes
SHA-256: 418403fbb352c941fb5575c3faf09f9bc0e482a21b5c1c350633a95d31baab7f
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 -  TApFDwL
' 0018     27 LABEL : Cell Value, String Constant - ACELiyyojays len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H192 
' 0018     27 LABEL : Cell Value, String Constant - avaxfhVgnSHV len=0 
' 0018     24 LABEL : Cell Value, String Constant - CwOLzmUKn len=0 
' 0018     21 LABEL : Cell Value, String Constant - HVmSWi len=0 
' 0018     20 LABEL : Cell Value, String Constant - JImJg len=0 
' 0018     21 LABEL : Cell Value, String Constant - LmOQZa len=0 
' 0018     23 LABEL : Cell Value, String Constant - mBciHkBP len=0 
' 0018     27 LABEL : Cell Value, String Constant - muWDPrgvlbaR len=0 
' 0018     27 LABEL : Cell Value, String Constant - nDpssYpBQMwX len=0 
' 0018     27 LABEL : Cell Value, String Constant - NjziziZBSnFK len=0 
' 0018     21 LABEL : Cell Value, String Constant - pXVEDs len=0 
' 0018     24 LABEL : Cell Value, String Constant - QOGqngolN len=0 
' 0018     25 LABEL : Cell Value, String Constant - ruOMNrnVJa len=0 
' 0018     26 LABEL : Cell Value, String Constant - VHvDssxfPxR len=0 
' 0018     22 LABEL : Cell Value, String Constant - WsgjHTU len=0 
' 0018     22 LABEL : Cell Value, String Constant - wvieRBo len=0 
' 0018     21 LABEL : Cell Value, String Constant - XVqpNI len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZQmqDxsMI len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZSjXxxmGq len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZvPtGoxpCot 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

... (truncated)

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