Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4d32e30e04e3d02c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:25:00 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 833cc35f184d017fd71e2a7924cef000 SHA-1: c75773f69be1740cc3c0cb046d0523426f7e7903 SHA-256: 4d32e30e04e3d02c0d498cb829ac3341903d3118ef183f746af2c5d29b17bcec
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 function, which is a known method for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN further indicates malicious intent. The macro sheet itself contains obfuscated data, suggesting an attempt to hide the 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) 6532 bytes
SHA-256: b9857dd702abd04288ed276246068a57c222f69b2efabcc9f8f47bb569d7302c
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 -  bdSskQRG
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F183 
' 0018     22 LABEL : Cell Value, String Constant - BVNmhIe len=0 
' 0018     27 LABEL : Cell Value, String Constant - cKJPKAGJZkBo len=0 
' 0018     25 LABEL : Cell Value, String Constant - ErcUrXeXmh len=0 
' 0018     21 LABEL : Cell Value, String Constant - EyugcI len=0 
' 0018     25 LABEL : Cell Value, String Constant - IIOZeYiOnX len=0 
' 0018     27 LABEL : Cell Value, String Constant - IXIFYZgXpYkW len=0 
' 0018     20 LABEL : Cell Value, String Constant - izMvm len=0 
' 0018     20 LABEL : Cell Value, String Constant - KcdLT len=0 
' 0018     22 LABEL : Cell Value, String Constant - kehPMPs len=0 
' 0018     27 LABEL : Cell Value, String Constant - MOrdvxIWyvEc len=0 
' 0018     23 LABEL : Cell Value, String Constant - RhetoWJa len=0 
' 0018     25 LABEL : Cell Value, String Constant - ROXWkuMCYu len=0 
' 0018     23 LABEL : Cell Value, String Constant - rUzTtRRl len=0 
' 0018     20 LABEL : Cell Value, String Constant - TTrMa len=0 
' 0018     22 LABEL : Cell Value, String Constant - uEJeSeI len=0 
' 0018     20 LABEL : Cell Value, String Constant - uLApy len=0 
' 0018     24 LABEL : Cell Value, String Constant - VetXeDOfu len=0 
' 0018     25 LABEL : Cell Value, String Constant - XJukhpXmWj len=0 
' 0018     25 LABEL : Cell Value, String Constant - xyztQLHDnA len=0 
' 0018     21 LABEL : Cell Value, String Constant - YAaJOi 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     10 
... (truncated)

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