Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 01cbffa154ec396b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:28 Authoring application: Microsoft Excel First seen: 2021-10-12
MD5: 5d8a447a4f8f35b1f93c74a7016be7b7 SHA-1: e68ef4ecfa0f6ac6b66c41e38e945e47beec6ee3 SHA-256: 01cbffa154ec396ba8b3a8204075eb9482d4c5a107d98be60ac731714569c89e
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-enabled workbook. Static analysis detected an Auto_Open defined name, indicating that the macro sheet will execute code automatically when the workbook is opened. The presence of dangerous formula APIs like RUN suggests the macro is designed 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) 6719 bytes
SHA-256: b5038140e1e9b0ae0ffef8c4c0e67d6dda23286eac954379f6817ba1826d40f9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  PtHRVWo
' 0018     21 LABEL : Cell Value, String Constant - aJWbbT len=0 
' 0018     25 LABEL : Cell Value, String Constant - aQsRnmPaYG len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H180 
' 0018     26 LABEL : Cell Value, String Constant - BzghNbEhKhv len=0 
' 0018     22 LABEL : Cell Value, String Constant - cdQUaKS len=0 
' 0018     20 LABEL : Cell Value, String Constant - csGxs len=0 
' 0018     25 LABEL : Cell Value, String Constant - DWpioeKqqM len=0 
' 0018     27 LABEL : Cell Value, String Constant - fiMUTQlTbWmk len=0 
' 0018     23 LABEL : Cell Value, String Constant - gfdcSWWm len=0 
' 0018     22 LABEL : Cell Value, String Constant - kxZvtGl len=0 
' 0018     26 LABEL : Cell Value, String Constant - LYvBgAGCOoc len=0 
' 0018     27 LABEL : Cell Value, String Constant - OtgSoLvaTaIy len=0 
' 0018     20 LABEL : Cell Value, String Constant - PPtEc len=0 
' 0018     27 LABEL : Cell Value, String Constant - QZgYrZjDbBSV len=0 
' 0018     21 LABEL : Cell Value, String Constant - rzmPwu len=0 
' 0018     26 LABEL : Cell Value, String Constant - tetJRBdxhyW len=0 
' 0018     20 LABEL : Cell Value, String Constant - UlkHC len=0 
' 0018     26 LABEL : Cell Value, String Constant - unlLfGvaAQD len=0 
' 0018     22 LABEL : Cell Value, String Constant - VGrkYkV len=0 
' 0018     24 LABEL : Cell Value, String Constant - vQRmDIXls len=0 
' 0018     20 LABEL : Cell Value, String Constant - YteaY 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)

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