Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 449a77362ef6c741…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:27:55 Authoring application: Microsoft Excel First seen: 2021-07-13
MD5: 75dbe403ef7671d75a9f905619e62780 SHA-1: 7994b706850836a99181625fbb3c716f7fe79560 SHA-256: 449a77362ef6c7416a251b89a84a9080774e87f6f4bc70e421532ea8cc6b9cad
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 defined name, which is a critical indicator of malicious intent. This technique is commonly used to execute arbitrary code upon opening the document. The presence of dangerous formula APIs like RUN suggests the macro is designed to download and execute 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) 6552 bytes
SHA-256: 908ba093e6aca4acadec135f1d496dd4798a479edda34f6caea74ed5ae5528ed
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  LdATgaTJ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H146 
' 0018     21 LABEL : Cell Value, String Constant - DGDkrB len=0 
' 0018     27 LABEL : Cell Value, String Constant - DlkUxsHVgpMi len=0 
' 0018     21 LABEL : Cell Value, String Constant - fFHgHf len=0 
' 0018     26 LABEL : Cell Value, String Constant - FRPNRuSGipt len=0 
' 0018     25 LABEL : Cell Value, String Constant - gvjeDXpUIc len=0 
' 0018     25 LABEL : Cell Value, String Constant - hfadcTAzWW len=0 
' 0018     25 LABEL : Cell Value, String Constant - izLJCfWpVj len=0 
' 0018     20 LABEL : Cell Value, String Constant - JALKm len=0 
' 0018     24 LABEL : Cell Value, String Constant - KeYsgOojm len=0 
' 0018     24 LABEL : Cell Value, String Constant - kGaQZcgnB len=0 
' 0018     21 LABEL : Cell Value, String Constant - KQzgEB len=0 
' 0018     20 LABEL : Cell Value, String Constant - OfbIv len=0 
' 0018     26 LABEL : Cell Value, String Constant - oPxHWazmtVI len=0 
' 0018     21 LABEL : Cell Value, String Constant - Pqfedv len=0 
' 0018     20 LABEL : Cell Value, String Constant - tpbNl len=0 
' 0018     23 LABEL : Cell Value, String Constant - UiRqvxgv len=0 
' 0018     22 LABEL : Cell Value, String Constant - UtWnLpb len=0 
' 0018     23 LABEL : Cell Value, String Constant - uYYlPdpD len=0 
' 0018     23 LABEL : Cell Value, String Constant - vNwezHcs len=0 
' 0018     21 LABEL : Cell Value, String Constant - xNwqWU 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 LABELS
... (truncated)

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