Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 41c7b8461df4375e…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:43:29 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: 2737713b65709351031ae7a3871d278e SHA-1: a18ba97f382e7ab0da2a19776910146a26383d45 SHA-256: 41c7b8461df4375e384625121b8b12130df5e01ff1ad7d1b3c729b54fc0589e9
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 indicating potential for automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. This pattern is commonly used to download and execute further malicious 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) 6711 bytes
SHA-256: 9d78c5170bea734a68893ad1f2706517df51d8ece4cb2cd747f7fde2f2e7a7b2
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  axOVoSKpg
' 0018     25 LABEL : Cell Value, String Constant - ApUEWswnue len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F150 
' 0018     26 LABEL : Cell Value, String Constant - BuNsJzyOLgS len=0 
' 0018     23 LABEL : Cell Value, String Constant - CcMshTpI len=0 
' 0018     24 LABEL : Cell Value, String Constant - DenxWSFGu len=0 
' 0018     21 LABEL : Cell Value, String Constant - FSaLbL len=0 
' 0018     23 LABEL : Cell Value, String Constant - GaIDTsnd len=0 
' 0018     20 LABEL : Cell Value, String Constant - JbkfS len=0 
' 0018     21 LABEL : Cell Value, String Constant - mNDiBi len=0 
' 0018     26 LABEL : Cell Value, String Constant - NTurXdjzEOk len=0 
' 0018     21 LABEL : Cell Value, String Constant - qCHohN len=0 
' 0018     20 LABEL : Cell Value, String Constant - QuNAN len=0 
' 0018     21 LABEL : Cell Value, String Constant - TATnVu len=0 
' 0018     21 LABEL : Cell Value, String Constant - uEGMNx len=0 
' 0018     22 LABEL : Cell Value, String Constant - UGTcsnA len=0 
' 0018     21 LABEL : Cell Value, String Constant - vWnQga len=0 
' 0018     20 LABEL : Cell Value, String Constant - WSHqC len=0 
' 0018     24 LABEL : Cell Value, String Constant - wWBnBMSrC len=0 
' 0018     23 LABEL : Cell Value, String Constant - XHJBUPbK len=0 
' 0018     22 LABEL : Cell Value, String Constant - YCasobF len=0 
' 0018     23 LABEL : Cell Value, String Constant - YtERbLrJ 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 : Cell 
... (truncated)

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