Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2634f6530f2d17f7…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:45 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 0371e1e9b5265caa019d1a04a242bf25 SHA-1: 6112aaa12a9fecb7b99fc55d6fd24ddc77bc3c62 SHA-256: 2634f6530f2d17f7377409e11756d6238daf33d7018a2487482895e0200ce504
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. The presence of dangerous formula APIs like RUN indicates that the macro is designed to execute arbitrary commands. The macro sheet itself contains obfuscated data, suggesting an attempt to hide 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) 6708 bytes
SHA-256: d1d8d26a6dec1dd6f89de9cc22c524210bb5d0bd4b2710010f6a37dca0db0bb5
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  XKsAEpy
' 0018     27 LABEL : Cell Value, String Constant - AIfJWBCbvbwd len=0 
' 0018     23 LABEL : Cell Value, String Constant - aUFGNuFR len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A172 
' 0018     27 LABEL : Cell Value, String Constant - bVJauYGlblpF len=0 
' 0018     23 LABEL : Cell Value, String Constant - CQwtZMuv len=0 
' 0018     20 LABEL : Cell Value, String Constant - DViYV len=0 
' 0018     23 LABEL : Cell Value, String Constant - GCCukUUx len=0 
' 0018     21 LABEL : Cell Value, String Constant - GClhyT len=0 
' 0018     21 LABEL : Cell Value, String Constant - gpVYCJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - JeMfYF len=0 
' 0018     21 LABEL : Cell Value, String Constant - oVytNG len=0 
' 0018     27 LABEL : Cell Value, String Constant - PSCgWNVsdhDE len=0 
' 0018     27 LABEL : Cell Value, String Constant - QWpxDjoBsuiJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - RuxrlVRYN len=0 
' 0018     25 LABEL : Cell Value, String Constant - VbFmkxVWxZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - vWAXAAZIwcn len=0 
' 0018     23 LABEL : Cell Value, String Constant - xsxzsXiE len=0 
' 0018     21 LABEL : Cell Value, String Constant - xUHAbW len=0 
' 0018     25 LABEL : Cell Value, String Constant - ykTCrYzxlf len=0 
' 0018     25 LABEL : Cell Value, String Constant - yosXORTtRB len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZphCzyWK 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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