Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f1c095da4fa4f03c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:40 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 707e3c34ebe458193eb651d8fefc3cdf SHA-1: 1de01f5abfbcfe75d8d22acf6afe1ee95fa9a30f SHA-256: f1c095da4fa4f03c1d7d9cf5927c783fdf47d34bf9f0805f40f73912d28254ea
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 sheet containing an Auto_Open defined name, which is a critical indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute external commands. This functionality is commonly used to download and execute further malicious payloads, making it a high-risk artifact.

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) 6588 bytes
SHA-256: 20fd1ea47b4dca3ee52dc61fb7037cdda8d7bbad6a3234411d19bdfa2d4a63c7
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 -  ZNoW
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B163 
' 0018     21 LABEL : Cell Value, String Constant - EviBQs len=0 
' 0018     26 LABEL : Cell Value, String Constant - hIJdTBGXwVp len=0 
' 0018     23 LABEL : Cell Value, String Constant - hknUtjbG len=0 
' 0018     22 LABEL : Cell Value, String Constant - HLLnXlS len=0 
' 0018     22 LABEL : Cell Value, String Constant - iIONfLM len=0 
' 0018     22 LABEL : Cell Value, String Constant - IrcjAgZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - kaztIaRQmE len=0 
' 0018     27 LABEL : Cell Value, String Constant - kSIZNNjxszcz len=0 
' 0018     23 LABEL : Cell Value, String Constant - MZLmyOjt len=0 
' 0018     24 LABEL : Cell Value, String Constant - nvXyknicz len=0 
' 0018     24 LABEL : Cell Value, String Constant - OIFMCCAGr len=0 
' 0018     21 LABEL : Cell Value, String Constant - QluNmF len=0 
' 0018     24 LABEL : Cell Value, String Constant - qNnPdhrib len=0 
' 0018     26 LABEL : Cell Value, String Constant - QpstiktJwUo len=0 
' 0018     26 LABEL : Cell Value, String Constant - qtcshFBmnTr len=0 
' 0018     24 LABEL : Cell Value, String Constant - TIRcUqmdg len=0 
' 0018     21 LABEL : Cell Value, String Constant - utWvfm len=0 
' 0018     22 LABEL : Cell Value, String Constant - XrVTtpA len=0 
' 0018     21 LABEL : Cell Value, String Constant - xzfWWo len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZCdzKqX 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)

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