Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d793edf03f5201ae…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:46:40 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: a529f5507add7e0e7c04ec2d4e8ec225 SHA-1: 150f0e548c846cf05b4a7c06ca23a60d37c37190 SHA-256: d793edf03f5201ae7d09d6bef87a0ca334880f55373f692515fc4266d5669a4d
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, which is a critical finding indicating potential malicious execution. The presence of dangerous formula APIs within the macro sheet further supports this assessment. The macro is designed to execute arbitrary code upon opening, likely serving as a loader for a secondary payload.

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) 6730 bytes
SHA-256: 2ca3dcaeee013e2046199b1e2cfa27c30c0d769419be9641b4bf8ffedf106563
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 -  DYvo
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I192 
' 0018     20 LABEL : Cell Value, String Constant - bBhnn len=0 
' 0018     25 LABEL : Cell Value, String Constant - BLjbhdfRQC len=0 
' 0018     26 LABEL : Cell Value, String Constant - CcPOiEHibDd len=0 
' 0018     27 LABEL : Cell Value, String Constant - cqNuwtsFPdPJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - DejgBjyFUVmy len=0 
' 0018     23 LABEL : Cell Value, String Constant - EEQvWsuj len=0 
' 0018     21 LABEL : Cell Value, String Constant - EHDfnL len=0 
' 0018     26 LABEL : Cell Value, String Constant - eMQqRdMWmck len=0 
' 0018     20 LABEL : Cell Value, String Constant - ffhkv len=0 
' 0018     25 LABEL : Cell Value, String Constant - HNOLFPdMMQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - MJnOT len=0 
' 0018     21 LABEL : Cell Value, String Constant - mJYbpa len=0 
' 0018     25 LABEL : Cell Value, String Constant - MkJqXHEpIG len=0 
' 0018     26 LABEL : Cell Value, String Constant - nEUlsgbIyAV len=0 
' 0018     25 LABEL : Cell Value, String Constant - OhegWeCpsF len=0 
' 0018     20 LABEL : Cell Value, String Constant - PhrKX len=0 
' 0018     21 LABEL : Cell Value, String Constant - QqQfVZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - UIhrV len=0 
' 0018     27 LABEL : Cell Value, String Constant - wvCjWFUeGeIh len=0 
' 0018     25 LABEL : Cell Value, String Constant - XJallkBSOp 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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