Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8c6e92c3d0fb9bd0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:37:55 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: e7f60eb98fb849b8e1488916a617b6fc SHA-1: 3e2491ff95f9846690ed8a7413b4f71b1b6b7e88 SHA-256: 8c6e92c3d0fb9bd064973063e29d2d20ab256d897e17bbff8be7e12c2cc8f15c
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 defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN further confirms the intent to execute arbitrary code. This suggests a macro-based attack designed to run malicious commands.

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) 6749 bytes
SHA-256: 823250f91e82a286ebb308c7c128782a44279dadd6914bccb8241c6e0e4d42e5
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 -  PSGGkEf
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E153 
' 0018     26 LABEL : Cell Value, String Constant - bImnZztvHlw len=0 
' 0018     27 LABEL : Cell Value, String Constant - BPwiFjiWDogO len=0 
' 0018     22 LABEL : Cell Value, String Constant - CtXizec len=0 
' 0018     22 LABEL : Cell Value, String Constant - CUGuSCY len=0 
' 0018     24 LABEL : Cell Value, String Constant - HwWhmKSHF len=0 
' 0018     21 LABEL : Cell Value, String Constant - ibtpsN len=0 
' 0018     21 LABEL : Cell Value, String Constant - IvPTEJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - iXEbYJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - kdGrwMBJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - LCSxTilhaGDM len=0 
' 0018     20 LABEL : Cell Value, String Constant - MPUiW len=0 
' 0018     20 LABEL : Cell Value, String Constant - Pwvzl len=0 
' 0018     23 LABEL : Cell Value, String Constant - rfKWWosL len=0 
' 0018     23 LABEL : Cell Value, String Constant - SVoklYSI len=0 
' 0018     26 LABEL : Cell Value, String Constant - uDAjmafWOjB len=0 
' 0018     24 LABEL : Cell Value, String Constant - vZzhkeQVE len=0 
' 0018     23 LABEL : Cell Value, String Constant - XJBGBQYC len=0 
' 0018     24 LABEL : Cell Value, String Constant - XXfmBpjXl len=0 
' 0018     26 LABEL : Cell Value, String Constant - zEPiaLLnrMd len=0 
' 0018     22 LABEL : Cell Value, String Constant - zKfdbGZ 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 
... (truncated)

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