Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4475b239cb6a18ab…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:39:55 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 146dc5129f90a9a86dce08e275255a46 SHA-1: 2e0648dd6c42d271a0e6d2e3ec9cd2acbdfd9b2e SHA-256: 4475b239cb6a18abd771ef58267d143a65bb494a0fc6101f167e45f57b16c8ba
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a critical finding. This indicates the macro sheet is designed to execute automatically upon opening the workbook. The presence of dangerous formula APIs like 'RUN' suggests the macro is intended to execute arbitrary code, likely to download and run 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) 6868 bytes
SHA-256: 8b1618fb0666a9df63e489556fcc19b7b9416809f9f66b6b301d71024d63ca26
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 -  pLoQdlSM
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C177 
' 0018     24 LABEL : Cell Value, String Constant - EubWUrRIx len=0 
' 0018     26 LABEL : Cell Value, String Constant - FCXAkBWpnSu len=0 
' 0018     23 LABEL : Cell Value, String Constant - hFPVVVdB len=0 
' 0018     27 LABEL : Cell Value, String Constant - hOrvhtCjRTQu len=0 
' 0018     20 LABEL : Cell Value, String Constant - lgHWr len=0 
' 0018     26 LABEL : Cell Value, String Constant - LQUYBagrlgZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - mFtMY len=0 
' 0018     21 LABEL : Cell Value, String Constant - MuCVzW len=0 
' 0018     24 LABEL : Cell Value, String Constant - MwFKLmAni len=0 
' 0018     20 LABEL : Cell Value, String Constant - pFBjX len=0 
' 0018     20 LABEL : Cell Value, String Constant - PxPeR len=0 
' 0018     22 LABEL : Cell Value, String Constant - pYoSXpp len=0 
' 0018     26 LABEL : Cell Value, String Constant - qfMrdWUgLKc len=0 
' 0018     20 LABEL : Cell Value, String Constant - qGNwr len=0 
' 0018     24 LABEL : Cell Value, String Constant - RdWrzZAUU len=0 
' 0018     22 LABEL : Cell Value, String Constant - SqoHOiP len=0 
' 0018     27 LABEL : Cell Value, String Constant - TcWPjKSjZswC len=0 
' 0018     27 LABEL : Cell Value, String Constant - TLYLSIWxchsy len=0 
' 0018     22 LABEL : Cell Value, String Constant - WQLvyBJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - xROEDGKNVC 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     1
... (truncated)

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