Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8c69cd2b440d5128…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:35 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 00e7f5f75108dc5163db50fc5f14948d SHA-1: 2b12705d0c47df441b5199689583882ca22e31bb SHA-256: 8c69cd2b440d512809a89a19de9d2057a844ab2b0aab01670082e043fa370890
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 macro, which is a known technique for executing malicious code when the workbook is opened. The presence of dangerous formula APIs like RUN indicates the macro is designed to execute arbitrary commands. 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) 6537 bytes
SHA-256: 79a95b369befda52552585a4adda88a3be24304afa99e5b8cd01294ff0ee26d6
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  tyL
' 0018     20 LABEL : Cell Value, String Constant - aiUCt len=0 
' 0018     27 LABEL : Cell Value, String Constant - albaJMTKIJIW len=0 
' 0018     27 LABEL : Cell Value, String Constant - aTCkEdPbPQzz len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F173 
' 0018     24 LABEL : Cell Value, String Constant - bZGLBrdIZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - DbVUOCfX len=0 
' 0018     24 LABEL : Cell Value, String Constant - fryGZfJbr len=0 
' 0018     24 LABEL : Cell Value, String Constant - fSXQCyKWv len=0 
' 0018     20 LABEL : Cell Value, String Constant - fVIIP len=0 
' 0018     20 LABEL : Cell Value, String Constant - GaRKL len=0 
' 0018     20 LABEL : Cell Value, String Constant - GFwFl len=0 
' 0018     25 LABEL : Cell Value, String Constant - GIJRgAxgqf len=0 
' 0018     21 LABEL : Cell Value, String Constant - jRMKFf len=0 
' 0018     24 LABEL : Cell Value, String Constant - JxkXkvKlz len=0 
' 0018     25 LABEL : Cell Value, String Constant - MlQozgrYgu len=0 
' 0018     25 LABEL : Cell Value, String Constant - oWFlGzZRGc len=0 
' 0018     23 LABEL : Cell Value, String Constant - RWpuDfRN len=0 
' 0018     22 LABEL : Cell Value, String Constant - uCcBnYK len=0 
' 0018     21 LABEL : Cell Value, String Constant - VnEypi len=0 
' 0018     25 LABEL : Cell Value, String Constant - wkckEeATKV len=0 
' 0018     26 LABEL : Cell Value, String Constant - xFABaIveFiP 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 LAB
... (truncated)

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