Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 220b62dfea9e5690…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:46:13 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 8a41f7565b3cee41199b5029aba75f65 SHA-1: 69dbfe0774b390691461f427a5e291cc4cf1d26f SHA-256: 220b62dfea9e56901c646d999b41d584f9ceec92230dd6b5cc68791e6b87aeb1
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 function, which is a known method for executing malicious code when an Excel file is opened. The presence of dangerous formula APIs like RUN further indicates malicious intent. Without further script content or network indicators, the exact payload and its purpose remain unclear, leading to an 'unknown family' classification.

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) 6655 bytes
SHA-256: 2980d487367822cbdf2ae4b66054e2cb6c7dc51a474173946cdf6e88a8ec3e18
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 -  XRkwPzEB
' 0018     22 LABEL : Cell Value, String Constant - aJDVtjZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - aqdsTVXt len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F187 
' 0018     21 LABEL : Cell Value, String Constant - BjPcNm len=0 
' 0018     27 LABEL : Cell Value, String Constant - cNABsBLEcTGn len=0 
' 0018     25 LABEL : Cell Value, String Constant - hYzRRhibzE len=0 
' 0018     26 LABEL : Cell Value, String Constant - IKmWsuYXqzl len=0 
' 0018     26 LABEL : Cell Value, String Constant - KdseFkiRpNf len=0 
' 0018     27 LABEL : Cell Value, String Constant - PTKWaUvovIoM len=0 
' 0018     23 LABEL : Cell Value, String Constant - qkCJwkfU len=0 
' 0018     24 LABEL : Cell Value, String Constant - RBNicZfwS len=0 
' 0018     22 LABEL : Cell Value, String Constant - RQWYScr len=0 
' 0018     25 LABEL : Cell Value, String Constant - sWSyRyAoBZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - tUavNeNsh len=0 
' 0018     21 LABEL : Cell Value, String Constant - XQkvOC len=0 
' 0018     26 LABEL : Cell Value, String Constant - xTvrMpEZaly len=0 
' 0018     27 LABEL : Cell Value, String Constant - YFLbbWfQCtZl len=0 
' 0018     25 LABEL : Cell Value, String Constant - yjTiOriuVU len=0 
' 0018     27 LABEL : Cell Value, String Constant - YxUNxiCFVpPL len=0 
' 0018     23 LABEL : Cell Value, String Constant - yzVZKqLI len=0 
' 0018     21 LABEL : Cell Value, String Constant - zetdBP 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 Constan
... (truncated)

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