Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 49ddd9d444abccc1…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:28 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 12422187d7b0dd7817a65c2d892843df SHA-1: 45d3bf7c08a58b2c80b3ba15f3221ab9273b5bda SHA-256: 49ddd9d444abccc1857ce6281567cee51e8af784b29b2561dcb050c08569345b
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

This Excel file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a known method for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates the macro is designed to execute arbitrary commands, likely leading to the download and execution of a second-stage payload.

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) 6560 bytes
SHA-256: 5b3ecd8dcf1ab26507e3439568cb0bfdf6261c2c0d40eec7ebfe688acf86f0e6
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  pTa
' 0018     26 LABEL : Cell Value, String Constant - AuRFgfFyUpY len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A166 
' 0018     24 LABEL : Cell Value, String Constant - aUURnJYRM len=0 
' 0018     21 LABEL : Cell Value, String Constant - CKreIY len=0 
' 0018     26 LABEL : Cell Value, String Constant - czhMzKnbKlY len=0 
' 0018     21 LABEL : Cell Value, String Constant - dWNepZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - EAqjmS len=0 
' 0018     21 LABEL : Cell Value, String Constant - ERzvId len=0 
' 0018     26 LABEL : Cell Value, String Constant - GPFbGtBNrOt len=0 
' 0018     26 LABEL : Cell Value, String Constant - IDFsbbZcprK len=0 
' 0018     25 LABEL : Cell Value, String Constant - JRPQLSgQXs len=0 
' 0018     25 LABEL : Cell Value, String Constant - LgbKnWYrvS len=0 
' 0018     21 LABEL : Cell Value, String Constant - lzxmCh len=0 
' 0018     27 LABEL : Cell Value, String Constant - nVFytwewvZkr len=0 
' 0018     25 LABEL : Cell Value, String Constant - pBWqNcBhPW len=0 
' 0018     24 LABEL : Cell Value, String Constant - tooxXCqrd len=0 
' 0018     25 LABEL : Cell Value, String Constant - uAEvKyQhtJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - wMBXluxnoHH len=0 
' 0018     22 LABEL : Cell Value, String Constant - xjamPOt len=0 
' 0018     24 LABEL : Cell Value, String Constant - xNojipXQd len=0 
' 0018     22 LABEL : Cell Value, String Constant - zNVlDrh 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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