Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 22756c72ca5b63c6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:28:34 Authoring application: Microsoft Excel First seen: 2021-10-07
MD5: 5c3c48b7e467e41503fe3275c2810732 SHA-1: 6fe3da28b36bb7e321197afcbc004eaff17ee4b0 SHA-256: 22756c72ca5b63c6d5e329a6ed2f3c55196dadc1ee43900703b3695586c17a1b
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 sheet is designed to automatically execute code upon opening the workbook. The presence of dangerous formula APIs like RUN further suggests malicious intent, likely to execute arbitrary commands or download further payloads.

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) 6479 bytes
SHA-256: 3bf6b65b4ea994743cda2e2cce553fb532ad662c81f3155e8fe33a2d5071851d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  gCkSsfZp
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G163 
' 0018     27 LABEL : Cell Value, String Constant - awgxzgLdWSca len=0 
' 0018     20 LABEL : Cell Value, String Constant - CArpD len=0 
' 0018     21 LABEL : Cell Value, String Constant - DwCyTI len=0 
' 0018     24 LABEL : Cell Value, String Constant - EfjoitfXS len=0 
' 0018     21 LABEL : Cell Value, String Constant - EheYyO len=0 
' 0018     20 LABEL : Cell Value, String Constant - FHZOm len=0 
' 0018     22 LABEL : Cell Value, String Constant - GpbjuGf len=0 
' 0018     26 LABEL : Cell Value, String Constant - HcmnCClenkQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - hptVhD len=0 
' 0018     26 LABEL : Cell Value, String Constant - HUjkGzgJxZh len=0 
' 0018     24 LABEL : Cell Value, String Constant - khCOMTgzp len=0 
' 0018     25 LABEL : Cell Value, String Constant - KHTPgAQJuw len=0 
' 0018     27 LABEL : Cell Value, String Constant - ktjuaOEnBXIu len=0 
' 0018     20 LABEL : Cell Value, String Constant - KUoFj len=0 
' 0018     20 LABEL : Cell Value, String Constant - lTDlF len=0 
' 0018     23 LABEL : Cell Value, String Constant - mvXgOPER len=0 
' 0018     21 LABEL : Cell Value, String Constant - niWbgF len=0 
' 0018     21 LABEL : Cell Value, String Constant - oCuewI len=0 
' 0018     21 LABEL : Cell Value, String Constant - OIdOkd len=0 
' 0018     20 LABEL : Cell Value, String Constant - wWjHX 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 LABELSST : Cel
... (truncated)

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