Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9784ad39a5b25c26…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:28 Authoring application: Microsoft Excel First seen: 2021-09-16
MD5: ece3c2a8d380f3ae2c064662744345cb SHA-1: 37b0210ee9a20b35402e9c2782f0c447408f50f0 SHA-256: 9784ad39a5b25c26323c03aaa60e87c35070a0b6529fdf8ecd90b4942f26ada7
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel 4.0 macro sheet containing an Auto_Open entry, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely downloading and running a secondary 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) 6355 bytes
SHA-256: ca0dc3517b9b63797942e7115e19f5b9704852dc5da326c21aa1b56f4271d687
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  uFu
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H150 
' 0018     20 LABEL : Cell Value, String Constant - CVAxM len=0 
' 0018     20 LABEL : Cell Value, String Constant - DurZA len=0 
' 0018     24 LABEL : Cell Value, String Constant - edIWGSoBh len=0 
' 0018     20 LABEL : Cell Value, String Constant - EySTM len=0 
' 0018     23 LABEL : Cell Value, String Constant - FBFUcwcw len=0 
' 0018     23 LABEL : Cell Value, String Constant - HAxAHQeq len=0 
' 0018     26 LABEL : Cell Value, String Constant - IEEHvIkzOLM len=0 
' 0018     24 LABEL : Cell Value, String Constant - JqGDZSrFp len=0 
' 0018     27 LABEL : Cell Value, String Constant - ltdxCQYqRWap len=0 
' 0018     20 LABEL : Cell Value, String Constant - lWmLg len=0 
' 0018     21 LABEL : Cell Value, String Constant - QhyshR len=0 
' 0018     24 LABEL : Cell Value, String Constant - QmAwsxWZX len=0 
' 0018     23 LABEL : Cell Value, String Constant - SIBWlbOf len=0 
' 0018     22 LABEL : Cell Value, String Constant - SmNcaNl len=0 
' 0018     26 LABEL : Cell Value, String Constant - tNOhvAQRwZQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - UeLlqZWBhLfC len=0 
' 0018     24 LABEL : Cell Value, String Constant - vFmHVRoSm len=0 
' 0018     21 LABEL : Cell Value, String Constant - VUItGH len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZQVHKliv len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZXWLeFnIyH 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 LABELS
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.