Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9e08fd7ef1b17e96…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:25:43 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 52d34abb2e452e2c506bb6d6182a2510 SHA-1: 309ec03d220f3356bac86901c6c1f7f667a982ea SHA-256: 9e08fd7ef1b17e96a646da1ac0415ad6536c8ab532d6ae3cd476b1ce6c8183d9
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 detected by multiple critical heuristics. The presence of an Auto_Open defined name indicates that malicious code will execute automatically when the workbook is opened. The macro sheet contains dangerous formula APIs, specifically the RUN function, which is used to execute arbitrary 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) 6511 bytes
SHA-256: c2a5a50b838ac3b9ac7d203a2d745f4c4b60dd99f51ec8a234cffc5713a61454
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xVeHgd
' 0018     26 LABEL : Cell Value, String Constant - ADFucgumsRX len=0 
' 0018     27 LABEL : Cell Value, String Constant - AOXeyXjrTzGG len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B176 
' 0018     23 LABEL : Cell Value, String Constant - biDnLKmU len=0 
' 0018     27 LABEL : Cell Value, String Constant - cInxnIVXgxwQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - IIlWy len=0 
' 0018     27 LABEL : Cell Value, String Constant - jLFlsxrvBsve len=0 
' 0018     26 LABEL : Cell Value, String Constant - JOUDKLcKRCI len=0 
' 0018     22 LABEL : Cell Value, String Constant - JuKHBTu len=0 
' 0018     21 LABEL : Cell Value, String Constant - LZXMdb len=0 
' 0018     21 LABEL : Cell Value, String Constant - mcsxlX len=0 
' 0018     26 LABEL : Cell Value, String Constant - MYiJDhZRgDq len=0 
' 0018     22 LABEL : Cell Value, String Constant - NeBqnbC len=0 
' 0018     25 LABEL : Cell Value, String Constant - nGgDTKbREg len=0 
' 0018     27 LABEL : Cell Value, String Constant - PpPPIOGkMBEU len=0 
' 0018     26 LABEL : Cell Value, String Constant - qoxuxPejTld len=0 
' 0018     22 LABEL : Cell Value, String Constant - SNVXWXz len=0 
' 0018     21 LABEL : Cell Value, String Constant - uZiBmF len=0 
' 0018     23 LABEL : Cell Value, String Constant - vcsezIgR len=0 
' 0018     23 LABEL : Cell Value, String Constant - WHljSBhF len=0 
' 0018     24 LABEL : Cell Value, String Constant - xIZTECiRk 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
'
... (truncated)

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