Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 86b1daa675996123…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:10 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 26b446ef80d185dca50a0ab2216d1c97 SHA-1: 0eeed41762cf27ed521cf49b9d4c9b107be2d485 SHA-256: 86b1daa675996123c814b5fbd91a5fb52c813f7c13cee1cfe2df3df1e2442952
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 indicating potential malicious execution. The presence of dangerous formula APIs like RUN further supports this. This suggests the macro is designed to execute arbitrary code upon opening the workbook.

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) 6755 bytes
SHA-256: 356ec709b59badcffddc07540a9322a96ca3f9705485a12be95a14182554ec1e
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 -  MHIUWecUalq
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C186 
' 0018     24 LABEL : Cell Value, String Constant - chAVQqfCx len=0 
' 0018     27 LABEL : Cell Value, String Constant - cMLMHobumrHB len=0 
' 0018     20 LABEL : Cell Value, String Constant - cnbYX len=0 
' 0018     23 LABEL : Cell Value, String Constant - EAlIDpfC len=0 
' 0018     27 LABEL : Cell Value, String Constant - gFEGLBBGNxqc len=0 
' 0018     24 LABEL : Cell Value, String Constant - ivcmhdBTj len=0 
' 0018     27 LABEL : Cell Value, String Constant - JILZfCXvomsB len=0 
' 0018     26 LABEL : Cell Value, String Constant - LWdXsZRiGBQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - LWnFGjYjdAV len=0 
' 0018     23 LABEL : Cell Value, String Constant - mCDVAbVN len=0 
' 0018     25 LABEL : Cell Value, String Constant - mUbHxywnyY len=0 
' 0018     22 LABEL : Cell Value, String Constant - PLspZGE len=0 
' 0018     25 LABEL : Cell Value, String Constant - qptYfoIadJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - RFewFChEJw len=0 
' 0018     26 LABEL : Cell Value, String Constant - sDArbySYQeJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - teCAtATa len=0 
' 0018     21 LABEL : Cell Value, String Constant - vcmiiX len=0 
' 0018     25 LABEL : Cell Value, String Constant - XzFaPVRLFc len=0 
' 0018     26 LABEL : Cell Value, String Constant - xziXUPfYogn len=0 
' 0018     22 LABEL : Cell Value, String Constant - zTRLgmI 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 Co
... (truncated)

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