Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c1f08200c849b6ac…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:39:06 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 72544f4c86e860d02116d21d5c2aeb57 SHA-1: 3fda3b5c254b9b99c9ff44a5656189b01619e4bf SHA-256: c1f08200c849b6ace290d024f5f4ea9f46b4cab4c4caf02535426ae37146801a
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 commands or download additional content. While no specific URLs or hashes were extracted, the macro's structure strongly implies a downloader or initial execution stage for a malicious payload.

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) 6871 bytes
SHA-256: 7357ad337b9f55f426a9bb432f4e457a9d61669f31512c890b2ac2636c9e412c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  qvKLVFNned
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F192 
' 0018     24 LABEL : Cell Value, String Constant - BxQqljPNv len=0 
' 0018     21 LABEL : Cell Value, String Constant - EfcXfO len=0 
' 0018     22 LABEL : Cell Value, String Constant - FuapGLn len=0 
' 0018     25 LABEL : Cell Value, String Constant - GNLejCiJkx len=0 
' 0018     21 LABEL : Cell Value, String Constant - HoHQzb len=0 
' 0018     24 LABEL : Cell Value, String Constant - HxsLoYhZN len=0 
' 0018     20 LABEL : Cell Value, String Constant - IQxxq len=0 
' 0018     22 LABEL : Cell Value, String Constant - KdimKmD len=0 
' 0018     23 LABEL : Cell Value, String Constant - kyCvMwUL len=0 
' 0018     27 LABEL : Cell Value, String Constant - lmBJdCthxZrC len=0 
' 0018     26 LABEL : Cell Value, String Constant - NkGNYBCruhh len=0 
' 0018     20 LABEL : Cell Value, String Constant - pEOAf len=0 
' 0018     25 LABEL : Cell Value, String Constant - qkeFiFuaTZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - qVuGLoCYbjj len=0 
' 0018     25 LABEL : Cell Value, String Constant - RHdkEXvawR len=0 
' 0018     25 LABEL : Cell Value, String Constant - VQpdtsXSwY len=0 
' 0018     23 LABEL : Cell Value, String Constant - VVydORrU len=0 
' 0018     23 LABEL : Cell Value, String Constant - WehHtDdX len=0 
' 0018     23 LABEL : Cell Value, String Constant - XySvigBl len=0 
' 0018     20 LABEL : Cell Value, String Constant - YHial 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)

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