Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 157277a36c407462…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:40:39 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: 50633f71e7c6f5208843de6072648861 SHA-1: e7ad26c2e23faa844d182db44c625c8d1fbc6c16 SHA-256: 157277a36c40746269a3d82283500661a1d9d84f4700780ef0993bfd3d573c59
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 function, 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. Without further script content, the exact payload and destination are unknown, but the mechanism points to a downloader or initial execution stage.

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) 6823 bytes
SHA-256: 4f0013e95f7c9412c396d3097ff05968dce1833b06ae23ea863ed2e76adaf45a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  IovNUFryTk
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D162 
' 0018     24 LABEL : Cell Value, String Constant - BbzGrNpMi len=0 
' 0018     25 LABEL : Cell Value, String Constant - BjCryhAeMg len=0 
' 0018     23 LABEL : Cell Value, String Constant - CyPslMHx len=0 
' 0018     24 LABEL : Cell Value, String Constant - GaGEtwFQf len=0 
' 0018     24 LABEL : Cell Value, String Constant - goTnHAebD len=0 
' 0018     20 LABEL : Cell Value, String Constant - hcEuS len=0 
' 0018     20 LABEL : Cell Value, String Constant - iBxpE len=0 
' 0018     23 LABEL : Cell Value, String Constant - JYpZhVEg len=0 
' 0018     22 LABEL : Cell Value, String Constant - ocwdvBg len=0 
' 0018     22 LABEL : Cell Value, String Constant - PooEMDI len=0 
' 0018     24 LABEL : Cell Value, String Constant - qAxtaiuGb len=0 
' 0018     27 LABEL : Cell Value, String Constant - RfRnQvwAuVaR len=0 
' 0018     23 LABEL : Cell Value, String Constant - RgJZXRBJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - sgGnJaoZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - sIOXnoTlDC len=0 
' 0018     23 LABEL : Cell Value, String Constant - Snvhuznx len=0 
' 0018     24 LABEL : Cell Value, String Constant - tDwdUMART len=0 
' 0018     22 LABEL : Cell Value, String Constant - TxCRDFI len=0 
' 0018     26 LABEL : Cell Value, String Constant - WRUjEFeEsId len=0 
' 0018     21 LABEL : Cell Value, String Constant - ybdxbv 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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