Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 23413de167b626c8…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:20 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 3ebb333ce0b012b69ab203172301c184 SHA-1: 1d99499da9183d569632b3d3d6360c187dc238c2 SHA-256: 23413de167b626c8780ccea512907d87cf3d437016ea29e99793faaabc0c0009
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 known technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands, likely to download and run a second-stage payload. No specific family could be identified from the available evidence.

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) 6533 bytes
SHA-256: 0a24c6778b61be6a38bcb5961bcff686209cc2f883a716ff4907842b6ace4760
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 -  rPnnopU
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C192 
' 0018     27 LABEL : Cell Value, String Constant - BdGKHMcCveKY len=0 
' 0018     26 LABEL : Cell Value, String Constant - DQmBWoonAsv len=0 
' 0018     23 LABEL : Cell Value, String Constant - eRiawqmJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - GbULATJSGU len=0 
' 0018     20 LABEL : Cell Value, String Constant - GFDOL len=0 
' 0018     20 LABEL : Cell Value, String Constant - GRWUM len=0 
' 0018     24 LABEL : Cell Value, String Constant - IkgIwRfJy len=0 
' 0018     22 LABEL : Cell Value, String Constant - ipSGEpY len=0 
' 0018     23 LABEL : Cell Value, String Constant - JyXAUycF len=0 
' 0018     27 LABEL : Cell Value, String Constant - lPbipNuFABHw len=0 
' 0018     27 LABEL : Cell Value, String Constant - MfEKVnPcYwms len=0 
' 0018     20 LABEL : Cell Value, String Constant - NGdIH len=0 
' 0018     27 LABEL : Cell Value, String Constant - pAoPAStpGuqL len=0 
' 0018     20 LABEL : Cell Value, String Constant - RamtC len=0 
' 0018     21 LABEL : Cell Value, String Constant - SbnNMN len=0 
' 0018     27 LABEL : Cell Value, String Constant - stYfJDyByuXb len=0 
' 0018     21 LABEL : Cell Value, String Constant - vdORSa len=0 
' 0018     24 LABEL : Cell Value, String Constant - wdqbmKkht len=0 
' 0018     26 LABEL : Cell Value, String Constant - XUiUMfmvKrR len=0 
' 0018     27 LABEL : Cell Value, String Constant - yskUxNYSNojz 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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