Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d67d08c1b422a85f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:07 Authoring application: Microsoft Excel First seen: 2021-09-17
MD5: 67bdb792ef54ff4e6faba4dc8c26fd49 SHA-1: e32f39373e62904e5979b4be7ce03187cfc1ba1d SHA-256: d67d08c1b422a85fc39b058b2591239d96fb5b3db9aa46c42b5e831505b7772a
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 heuristic firing. This indicates the macro sheet is designed to execute automatically upon opening the workbook. The presence of dangerous formula APIs like RUN suggests the macro is intended to execute arbitrary commands, likely to download and run a second-stage payload. No specific IOCs like URLs or hashes were extracted from the macro content.

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) 6864 bytes
SHA-256: 3179d5f4b9418de185c9e642089b54c45a16660fa9be059f4baff034fc3e15a5
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ASzxSuvgmLq
' 0018     23 LABEL : Cell Value, String Constant - acQJquBm len=0 
' 0018     21 LABEL : Cell Value, String Constant - Ajuenp len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F189 
' 0018     22 LABEL : Cell Value, String Constant - CJqOOLi len=0 
' 0018     23 LABEL : Cell Value, String Constant - EhQJPwqt len=0 
' 0018     25 LABEL : Cell Value, String Constant - fFovSShIQy len=0 
' 0018     26 LABEL : Cell Value, String Constant - geLQpYBKVUd len=0 
' 0018     21 LABEL : Cell Value, String Constant - hInrxC len=0 
' 0018     25 LABEL : Cell Value, String Constant - IPkJPJHroC len=0 
' 0018     25 LABEL : Cell Value, String Constant - IvXlDqzDgN len=0 
' 0018     25 LABEL : Cell Value, String Constant - jfNWizeBSX len=0 
' 0018     25 LABEL : Cell Value, String Constant - jhkYSpJizT len=0 
' 0018     24 LABEL : Cell Value, String Constant - JQTFYWFvt len=0 
' 0018     23 LABEL : Cell Value, String Constant - LxaPcyIZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - NbtbjiBu len=0 
' 0018     22 LABEL : Cell Value, String Constant - OUDYcGk len=0 
' 0018     21 LABEL : Cell Value, String Constant - qOgsSB len=0 
' 0018     24 LABEL : Cell Value, String Constant - qvWPylWTt len=0 
' 0018     20 LABEL : Cell Value, String Constant - rDuhc len=0 
' 0018     20 LABEL : Cell Value, String Constant - uKbLI len=0 
' 0018     25 LABEL : Cell Value, String Constant - YdUNuqZlvr 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     1
... (truncated)

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