Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 be1e2b4458e64219…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:44:50 Authoring application: Microsoft Excel First seen: 2021-05-26
MD5: ca64216d94bd397aeab117e54accdd9a SHA-1: da24fa05497f5cdc8c1f0d667891f84a7b9fc3a8 SHA-256: be1e2b4458e64219530d7f6867705c7186a784a9ce27f7e88a1a402c536a2d45
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains critical heuristic firings indicating the presence of Excel 4.0 macros with an Auto_Open entry and the use of dangerous formula APIs. This suggests the macro is designed to execute code upon opening the document, likely to download and execute a secondary payload. No specific family could be identified.

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) 6551 bytes
SHA-256: b28fe8ba4e09715e4aea865fea8f6ea623b00ac396e618bb758fc9e28ec56b34
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 -  bfFEMpYJW
' 0018     26 LABEL : Cell Value, String Constant - AqBeTEoISar len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A131 
' 0018     21 LABEL : Cell Value, String Constant - BFcbvh len=0 
' 0018     25 LABEL : Cell Value, String Constant - BGUccZIwQQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - dOcNNlGnjKsG len=0 
' 0018     23 LABEL : Cell Value, String Constant - EIbmAHXS len=0 
' 0018     21 LABEL : Cell Value, String Constant - ENskyp len=0 
' 0018     22 LABEL : Cell Value, String Constant - jPijJus len=0 
' 0018     21 LABEL : Cell Value, String Constant - JyIuGP len=0 
' 0018     22 LABEL : Cell Value, String Constant - KFCatFj len=0 
' 0018     25 LABEL : Cell Value, String Constant - KgjJoNTFVT len=0 
' 0018     26 LABEL : Cell Value, String Constant - mfHQgRuwMjk len=0 
' 0018     24 LABEL : Cell Value, String Constant - mjpfbABIt len=0 
' 0018     24 LABEL : Cell Value, String Constant - qlYBsxKnS len=0 
' 0018     22 LABEL : Cell Value, String Constant - qsGoyfA len=0 
' 0018     21 LABEL : Cell Value, String Constant - RDGgww len=0 
' 0018     27 LABEL : Cell Value, String Constant - RdPoXEbUjHfb len=0 
' 0018     22 LABEL : Cell Value, String Constant - rKrtUKI len=0 
' 0018     21 LABEL : Cell Value, String Constant - TEtfQG len=0 
' 0018     22 LABEL : Cell Value, String Constant - TEYGoRa len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZwUqjnXa 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     1
... (truncated)

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