Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8670da6aec10e4a1…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-27 11:46:49 Authoring application: Microsoft Excel First seen: 2021-10-04
MD5: 791af2ebb1ea4d0440975d0ccc7d39ee SHA-1: 8b24b1e92cf4559c6f5452c53bacb95ccca79a1a SHA-256: 8670da6aec10e4a1ca90f5c0790be693555e4ddef3b31282d49e745af5eebaf0
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 defined name, which is a critical finding indicating potential for arbitrary code execution. The presence of dangerous formula APIs like RUN further supports this. The macro sheet is likely designed to download and execute a secondary payload, although the specific commands are obfuscated within the macro code.

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) 6904 bytes
SHA-256: b6de636d1c16a63867d80cb7f25ffbb315a54322afd6228ae2c4d32e4951a971
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 -  yFfczQke
' 0018     24 LABEL : Cell Value, String Constant - AccJIBMIM len=0 
' 0018     27 LABEL : Cell Value, String Constant - aSNcERdLkfgV len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F168 
' 0018     25 LABEL : Cell Value, String Constant - bToTnIPOWy len=0 
' 0018     20 LABEL : Cell Value, String Constant - CLZoF len=0 
' 0018     24 LABEL : Cell Value, String Constant - eUqigmSZE len=0 
' 0018     23 LABEL : Cell Value, String Constant - fVHKZxcM len=0 
' 0018     26 LABEL : Cell Value, String Constant - IjGxZnpRvXU len=0 
' 0018     21 LABEL : Cell Value, String Constant - jxshgK len=0 
' 0018     26 LABEL : Cell Value, String Constant - kwXqFtmxDqH len=0 
' 0018     24 LABEL : Cell Value, String Constant - LpSRhhkfX len=0 
' 0018     22 LABEL : Cell Value, String Constant - MBmbFPT len=0 
' 0018     27 LABEL : Cell Value, String Constant - oOMlLWHvYsPn len=0 
' 0018     25 LABEL : Cell Value, String Constant - QJVzDqhotL len=0 
' 0018     21 LABEL : Cell Value, String Constant - RHDFbW len=0 
' 0018     26 LABEL : Cell Value, String Constant - rLQCQbLPMKs len=0 
' 0018     24 LABEL : Cell Value, String Constant - SiVxfobWE len=0 
' 0018     26 LABEL : Cell Value, String Constant - TFFhOAFqXBY len=0 
' 0018     27 LABEL : Cell Value, String Constant - WxDhNhicsPxY len=0 
' 0018     25 LABEL : Cell Value, String Constant - YbpofBBlvM len=0 
' 0018     25 LABEL : Cell Value, String Constant - zxaEpciAAL 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 Cons
... (truncated)

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