Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 061baa296667ad6c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:28:44 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 788840a932580467d2c8050fd7af0ce5 SHA-1: 72848aafe22427a0776e69a6c44b76d2a80ae064 SHA-256: 061baa296667ad6cacd322748dac9ad03070545de6bed4482c18a5a9547b92de
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 containing an Auto_Open defined name, which is a critical indicator of malicious intent. This technique is commonly used to execute arbitrary code upon opening the document, typically to download and run a second-stage payload. No specific IOCs were extracted, but the presence of the Auto_Open macro is sufficient to infer malicious activity.

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) 6422 bytes
SHA-256: e6e7d90893105f5384b8fcf9d4ce7dfc47dd5b1bd81b9c6f3f5310c3ba78c66d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  HYrY
' 0018     22 LABEL : Cell Value, String Constant - AnAGgLW len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F148 
' 0018     21 LABEL : Cell Value, String Constant - cdYWEn len=0 
' 0018     27 LABEL : Cell Value, String Constant - cjfOZQSCyyxP len=0 
' 0018     25 LABEL : Cell Value, String Constant - DuwnKIpdgs len=0 
' 0018     21 LABEL : Cell Value, String Constant - FCanOl len=0 
' 0018     27 LABEL : Cell Value, String Constant - JIytDgtkthGF len=0 
' 0018     27 LABEL : Cell Value, String Constant - lIFESdnwjqgd len=0 
' 0018     24 LABEL : Cell Value, String Constant - lmsdlNJnm len=0 
' 0018     25 LABEL : Cell Value, String Constant - LQMurABTFz len=0 
' 0018     22 LABEL : Cell Value, String Constant - NfAGHTN len=0 
' 0018     24 LABEL : Cell Value, String Constant - niFUdozaF len=0 
' 0018     27 LABEL : Cell Value, String Constant - ROfEMxBeAcXH len=0 
' 0018     20 LABEL : Cell Value, String Constant - SlwVs len=0 
' 0018     21 LABEL : Cell Value, String Constant - taLLfS len=0 
' 0018     22 LABEL : Cell Value, String Constant - TbUuaxO len=0 
' 0018     23 LABEL : Cell Value, String Constant - TQoDPBCi len=0 
' 0018     26 LABEL : Cell Value, String Constant - wvnGMHHupoI len=0 
' 0018     27 LABEL : Cell Value, String Constant - WwYdSwRmaKXL len=0 
' 0018     23 LABEL : Cell Value, String Constant - YtEDoMLK len=0 
' 0018     22 LABEL : Cell Value, String Constant - zAyHKbo 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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