Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ba25028973fe1bb1…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:46:11 Authoring application: Microsoft Excel First seen: 2021-06-04
MD5: fa810b503127422cd62ff73b0f1fce63 SHA-1: cfb350e429cf85ee12d2cd7de2c2f631ead98101 SHA-256: ba25028973fe1bb1abc585c9aa0f64d86f4f566a48f345ac8548fe1a8e16e795
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open function, which is a common technique for executing malicious code upon opening. The presence of dangerous formula APIs in the Auto_Open macro indicates an intent to run arbitrary commands. This suggests the file is likely a downloader or initial execution vector for further malicious activity.

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) 6730 bytes
SHA-256: 8bf8fa771cf4a5434eb7b6cd0f4b8c657dbc4463c619282a3471b963a3175741
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WkqSXydQgOo
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B141 
' 0018     27 LABEL : Cell Value, String Constant - CMRXJGPOXblO len=0 
' 0018     27 LABEL : Cell Value, String Constant - cpSdEjgddSHR len=0 
' 0018     27 LABEL : Cell Value, String Constant - CzBNenhVfsdA len=0 
' 0018     26 LABEL : Cell Value, String Constant - dPvFsQzNhwG len=0 
' 0018     24 LABEL : Cell Value, String Constant - dXbviHtHS len=0 
' 0018     24 LABEL : Cell Value, String Constant - DxRmEMVHT len=0 
' 0018     20 LABEL : Cell Value, String Constant - EdvZD len=0 
' 0018     25 LABEL : Cell Value, String Constant - lAApfweHAM len=0 
' 0018     22 LABEL : Cell Value, String Constant - OpyeubI len=0 
' 0018     23 LABEL : Cell Value, String Constant - pxBINbiw len=0 
' 0018     21 LABEL : Cell Value, String Constant - QDVsDF len=0 
' 0018     21 LABEL : Cell Value, String Constant - qJAyXO len=0 
' 0018     25 LABEL : Cell Value, String Constant - SWawAtIoRy len=0 
' 0018     27 LABEL : Cell Value, String Constant - vEjkGZtuLEea len=0 
' 0018     21 LABEL : Cell Value, String Constant - VqlGsA len=0 
' 0018     25 LABEL : Cell Value, String Constant - WVFNCWNXQt len=0 
' 0018     22 LABEL : Cell Value, String Constant - xAEDvaK len=0 
' 0018     20 LABEL : Cell Value, String Constant - XOSWD len=0 
' 0018     27 LABEL : Cell Value, String Constant - yqrpdwPjrgUR len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZFbjTxBrO 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/ S
... (truncated)

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