Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b1ba96fce2972c17…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:28:11 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: c093efab25b99fac3f51341738a54b5a SHA-1: 45ad01d83d58184a4425348a0d046afc795830a9 SHA-256: b1ba96fce2972c17b4ce68751ee03b3e647b02d8e9bf8b7585f159d9528f20ef
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 method for executing malicious code. The critical heuristics indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it's designed to run arbitrary commands or exploit vulnerabilities. No specific family could be identified, but the technique is common for initial execution.

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) 6672 bytes
SHA-256: 0a1e37f7a7a5d35f9d5ab86b81e9b8c989108fd97a5b2cdab492fd151a8f982a
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 -  zpHaPGtgJAi
' 0018     24 LABEL : Cell Value, String Constant - AIbsfRHtF len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F146 
' 0018     23 LABEL : Cell Value, String Constant - CirvDHZT len=0 
' 0018     27 LABEL : Cell Value, String Constant - CqoKAtcKVvir len=0 
' 0018     26 LABEL : Cell Value, String Constant - fKsNvEHqFia len=0 
' 0018     26 LABEL : Cell Value, String Constant - icsSoSDtNEv len=0 
' 0018     23 LABEL : Cell Value, String Constant - IwCJaJQn len=0 
' 0018     22 LABEL : Cell Value, String Constant - JisUQQB len=0 
' 0018     25 LABEL : Cell Value, String Constant - KNfiuHAOhx len=0 
' 0018     22 LABEL : Cell Value, String Constant - Lmaogkq len=0 
' 0018     26 LABEL : Cell Value, String Constant - nHHZcacFqGS len=0 
' 0018     21 LABEL : Cell Value, String Constant - nWOAQg len=0 
' 0018     21 LABEL : Cell Value, String Constant - qrzFYP len=0 
' 0018     26 LABEL : Cell Value, String Constant - rIaVCBfBwUE len=0 
' 0018     27 LABEL : Cell Value, String Constant - TFijuRAeSpnz len=0 
' 0018     23 LABEL : Cell Value, String Constant - UtHXOdmo len=0 
' 0018     24 LABEL : Cell Value, String Constant - vAndmXRSB len=0 
' 0018     26 LABEL : Cell Value, String Constant - wLHStJWOtDO len=0 
' 0018     22 LABEL : Cell Value, String Constant - wMTFJCH len=0 
' 0018     21 LABEL : Cell Value, String Constant - ysLGZE len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZrXFXJShX 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/ 
... (truncated)

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