Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 38a7b2c66baaf0da…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:14 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: 1da4d1708897ea44b484d5c0f8e80722 SHA-1: 2c3f240498d6eca6ba9f53cd3b9c14603fc167c0 SHA-256: 38a7b2c66baaf0dad5097efcc7f4d252b5cafb7bb1f5c96c2b0f47b409838d5f
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 critical finding. This indicates the file is designed to automatically execute malicious code upon opening. The presence of dangerous formula APIs further supports the malicious intent, likely for arbitrary code execution.

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) 6774 bytes
SHA-256: 6e2274a9a7a78b13cd9971cf7785835b67821b4b825306cff15a1dcbc3a61e90
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 -  gmQTJKCs
' 0018     22 LABEL : Cell Value, String Constant - ahbYGsF len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D156 
' 0018     27 LABEL : Cell Value, String Constant - ClQWiyOJHjMd len=0 
' 0018     26 LABEL : Cell Value, String Constant - DBtEDbQDhAi len=0 
' 0018     26 LABEL : Cell Value, String Constant - EQpUdDTqSDk len=0 
' 0018     24 LABEL : Cell Value, String Constant - hBmOSYHqr len=0 
' 0018     24 LABEL : Cell Value, String Constant - hwsNskqDp len=0 
' 0018     21 LABEL : Cell Value, String Constant - ihXHea len=0 
' 0018     24 LABEL : Cell Value, String Constant - iwAFJLrFB len=0 
' 0018     25 LABEL : Cell Value, String Constant - JTfndPIuMT len=0 
' 0018     20 LABEL : Cell Value, String Constant - KKXfN len=0 
' 0018     27 LABEL : Cell Value, String Constant - NejfknFzuoBG len=0 
' 0018     22 LABEL : Cell Value, String Constant - NhgTree len=0 
' 0018     27 LABEL : Cell Value, String Constant - OHqfNWSFEALv len=0 
' 0018     25 LABEL : Cell Value, String Constant - OXCpClJsru len=0 
' 0018     23 LABEL : Cell Value, String Constant - RatWHhLd len=0 
' 0018     22 LABEL : Cell Value, String Constant - rPgsmbA len=0 
' 0018     26 LABEL : Cell Value, String Constant - syMEIQoxGEi len=0 
' 0018     22 LABEL : Cell Value, String Constant - tnHRytB len=0 
' 0018     20 LABEL : Cell Value, String Constant - uqfkQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - vpxDL 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
' 00f
... (truncated)

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