Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 281d67495c99c1eb…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:00 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 27a1359e73ef5295fd317158955ddc61 SHA-1: df67b39d8fea7d9488eefeb58d369c6b6764cb11 SHA-256: 281d67495c99c1ebb04a3ab899ea21973c59846e0fbfcad74645909cb916ac34
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 within spreadsheets. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands or download further payloads. The document body contains heavily obfuscated text, suggesting an attempt to hide the malicious intent.

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) 6490 bytes
SHA-256: 53b263e0a17b28db6f96bbd9781a0dec52932119fdf4780ba9159bc65217e088
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 -  wsUSCxx
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A173 
' 0018     20 LABEL : Cell Value, String Constant - csMHF len=0 
' 0018     20 LABEL : Cell Value, String Constant - dQZFT len=0 
' 0018     23 LABEL : Cell Value, String Constant - dWGwLpKL len=0 
' 0018     25 LABEL : Cell Value, String Constant - FAEvFXegOK len=0 
' 0018     22 LABEL : Cell Value, String Constant - futpbQM len=0 
' 0018     21 LABEL : Cell Value, String Constant - GvVnSZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - ISnId len=0 
' 0018     23 LABEL : Cell Value, String Constant - kXHgoKIB len=0 
' 0018     21 LABEL : Cell Value, String Constant - nxJCcv len=0 
' 0018     25 LABEL : Cell Value, String Constant - OCjZiSVnjJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - pOJvY len=0 
' 0018     20 LABEL : Cell Value, String Constant - pxMsm len=0 
' 0018     25 LABEL : Cell Value, String Constant - SsXhcpJowd len=0 
' 0018     26 LABEL : Cell Value, String Constant - ueYlBgZOvma len=0 
' 0018     25 LABEL : Cell Value, String Constant - uodiQYieAV len=0 
' 0018     24 LABEL : Cell Value, String Constant - wKcMSxBwC len=0 
' 0018     20 LABEL : Cell Value, String Constant - ykISz len=0 
' 0018     20 LABEL : Cell Value, String Constant - zfNiN len=0 
' 0018     22 LABEL : Cell Value, String Constant - zRdgljr len=0 
' 0018     26 LABEL : Cell Value, String Constant - zYBHUROInUn 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 V
... (truncated)

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