Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9e0aa7a77238c042…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:43 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 9f86cf4546e6dc2522b0b67568c80dd8 SHA-1: 6c4520d6c5e600a30afcd0129955fc14c4a66356 SHA-256: 9e0aa7a77238c04238189d84cf025a0c04e2528defbfbf5a98ad5e486a54bca6
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 malicious execution. The presence of dangerous formula APIs like RUN further supports this. The macro sheet is likely designed to execute arbitrary code upon opening the document, a common technique for initial 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) 6426 bytes
SHA-256: e3ff3689be76f74fd6622965da87985fe6c36ff8e0d6b56b00463f0eb5e9bbed
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 -  vBjt
' 0018     24 LABEL : Cell Value, String Constant - AEMLSpMcl len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G183 
' 0018     23 LABEL : Cell Value, String Constant - dikKbBCx len=0 
' 0018     23 LABEL : Cell Value, String Constant - DJLlvkHA len=0 
' 0018     26 LABEL : Cell Value, String Constant - ffgonmiLoXg len=0 
' 0018     27 LABEL : Cell Value, String Constant - FswOAZvPsIvm len=0 
' 0018     21 LABEL : Cell Value, String Constant - fZuMov len=0 
' 0018     23 LABEL : Cell Value, String Constant - IsMzoIuE len=0 
' 0018     24 LABEL : Cell Value, String Constant - JLvQNNTWO len=0 
' 0018     21 LABEL : Cell Value, String Constant - JQFasy len=0 
' 0018     22 LABEL : Cell Value, String Constant - lyEssEo len=0 
' 0018     23 LABEL : Cell Value, String Constant - mmxhIQuy len=0 
' 0018     24 LABEL : Cell Value, String Constant - MtDwoHDfH len=0 
' 0018     26 LABEL : Cell Value, String Constant - NLxLwnpCYll len=0 
' 0018     20 LABEL : Cell Value, String Constant - QIHrT len=0 
' 0018     25 LABEL : Cell Value, String Constant - qipBaXEmqQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - TpwDpTdcUKP len=0 
' 0018     26 LABEL : Cell Value, String Constant - uUamkuaiFOs len=0 
' 0018     21 LABEL : Cell Value, String Constant - VNzJFw len=0 
' 0018     21 LABEL : Cell Value, String Constant - VsIacF len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZoyzeFvlGzk 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    
... (truncated)

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