Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9b5fda5692e7d9ac…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:30:02 Authoring application: Microsoft Excel First seen: 2021-06-17
MD5: 8aaa1735ddd567722563dd030e60951c SHA-1: b937f6d16b73c737ae868f7747ca23af3486d6cb SHA-256: 9b5fda5692e7d9ac40e642897b9296f481078899b56c07c3aaef77d6e6ecea60
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 function. This function is designed to automatically execute when the workbook is opened, indicating an attempt to run malicious code. The presence of dangerous formula APIs like RUN suggests the macro is intended to download and execute a secondary payload, a common technique for initial access and further compromise.

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) 6455 bytes
SHA-256: aa210d40780a85e20eac0ac32399345938b3cda9418045e5b1cda8894652f958
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 -  YwEFwdP
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B174 
' 0018     22 LABEL : Cell Value, String Constant - avKGXpx len=0 
' 0018     20 LABEL : Cell Value, String Constant - bsilw len=0 
' 0018     24 LABEL : Cell Value, String Constant - eNZGCnjxg len=0 
' 0018     23 LABEL : Cell Value, String Constant - eQkSODEM len=0 
' 0018     21 LABEL : Cell Value, String Constant - HAEKBJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - HwOokq len=0 
' 0018     21 LABEL : Cell Value, String Constant - laEmEG len=0 
' 0018     21 LABEL : Cell Value, String Constant - LsqhWV len=0 
' 0018     24 LABEL : Cell Value, String Constant - LUtJHHZZN len=0 
' 0018     26 LABEL : Cell Value, String Constant - lXGSokJgFxi len=0 
' 0018     20 LABEL : Cell Value, String Constant - nHuGr len=0 
' 0018     22 LABEL : Cell Value, String Constant - PUhyhlr len=0 
' 0018     22 LABEL : Cell Value, String Constant - PvdwLsS len=0 
' 0018     27 LABEL : Cell Value, String Constant - uoCDcHVVcAyr len=0 
' 0018     23 LABEL : Cell Value, String Constant - WMlrcMqU len=0 
' 0018     20 LABEL : Cell Value, String Constant - WvFhZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - xjjPeuo len=0 
' 0018     27 LABEL : Cell Value, String Constant - xvLOVTCDdTXS len=0 
' 0018     24 LABEL : Cell Value, String Constant - yuoVQJLZv len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZqPwg 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
... (truncated)

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