Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e86c47ca66249ee4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:31:05 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: cf592e91174edb8cb0719a17a8099d07 SHA-1: 7217f793f3dfe9442084be841d5175352c75c17b SHA-256: e86c47ca66249ee4430ec128da88050dab31a611352980ed136f5a8e3e90431e
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 macros, specifically an Auto_Open macro. This macro is designed to execute arbitrary commands, which is a common technique for downloading and executing further malicious content. The presence of the Auto_Open entry and the use of dangerous formula APIs strongly indicate malicious intent.

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) 6389 bytes
SHA-256: 84bb7d80a433a8eadb6d52d473d23f82383e620c9af8f6c97b78e27fd4122785
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 -  NsIy
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G132 
' 0018     27 LABEL : Cell Value, String Constant - BuhSyKYKToZL len=0 
' 0018     27 LABEL : Cell Value, String Constant - cdqjljTceOay len=0 
' 0018     24 LABEL : Cell Value, String Constant - CFzHZbrlt len=0 
' 0018     25 LABEL : Cell Value, String Constant - dcUtgUdEHO len=0 
' 0018     20 LABEL : Cell Value, String Constant - dVQqq len=0 
' 0018     20 LABEL : Cell Value, String Constant - EMRom len=0 
' 0018     22 LABEL : Cell Value, String Constant - fqBWxaa len=0 
' 0018     26 LABEL : Cell Value, String Constant - fuUtSJZJXPg len=0 
' 0018     22 LABEL : Cell Value, String Constant - Giyxbeb len=0 
' 0018     20 LABEL : Cell Value, String Constant - kQPUm len=0 
' 0018     21 LABEL : Cell Value, String Constant - lQmGvH len=0 
' 0018     25 LABEL : Cell Value, String Constant - NMnGnwESqg len=0 
' 0018     27 LABEL : Cell Value, String Constant - nuLXVtknmkhk len=0 
' 0018     22 LABEL : Cell Value, String Constant - odShfUT len=0 
' 0018     21 LABEL : Cell Value, String Constant - paFSVP len=0 
' 0018     21 LABEL : Cell Value, String Constant - QWwKNp len=0 
' 0018     21 LABEL : Cell Value, String Constant - RRPEaQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - SBPluLQfGyu len=0 
' 0018     23 LABEL : Cell Value, String Constant - SHmDGDui len=0 
' 0018     26 LABEL : Cell Value, String Constant - uHRJgkYCFHU 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 LA
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.