Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bc606f972ac8a393…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:39:31 Authoring application: Microsoft Excel First seen: 2021-10-16
MD5: 07410e7d6aea2b2801b0b101076fd369 SHA-1: f192035ad0a2a7fc09f06a7bbe7797ac66392a16 SHA-256: bc606f972ac8a393d9d1c15ceb859533a6171c150cb9dae11afa306cb3aa0ba0
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 indicating automatic execution upon opening. The macros utilize dangerous formula APIs, including 'RUN', suggesting an attempt to execute arbitrary commands. This pattern is commonly used to download and execute further malicious content.

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) 6803 bytes
SHA-256: d6c2b0b2af9c8d9fe4257ab4e60541e257ab42d0a06670b2f088a1d694cb7012
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xbDjhgiHq
' 0018     24 LABEL : Cell Value, String Constant - asSdXDpEA len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G177 
' 0018     20 LABEL : Cell Value, String Constant - CNQfz len=0 
' 0018     23 LABEL : Cell Value, String Constant - DFzZjzFN len=0 
' 0018     20 LABEL : Cell Value, String Constant - DhAqV len=0 
' 0018     24 LABEL : Cell Value, String Constant - ePcUPulNe len=0 
' 0018     23 LABEL : Cell Value, String Constant - FBPHLwup len=0 
' 0018     21 LABEL : Cell Value, String Constant - felqrz len=0 
' 0018     24 LABEL : Cell Value, String Constant - ghdRjpSUF len=0 
' 0018     24 LABEL : Cell Value, String Constant - grzqbNigO len=0 
' 0018     22 LABEL : Cell Value, String Constant - ifdDLpH len=0 
' 0018     24 LABEL : Cell Value, String Constant - ioHDkSVjS len=0 
' 0018     21 LABEL : Cell Value, String Constant - iyPCUi len=0 
' 0018     21 LABEL : Cell Value, String Constant - JxgbOo len=0 
' 0018     20 LABEL : Cell Value, String Constant - KAzuS len=0 
' 0018     23 LABEL : Cell Value, String Constant - LYHCNvZa len=0 
' 0018     22 LABEL : Cell Value, String Constant - NISOFqH len=0 
' 0018     26 LABEL : Cell Value, String Constant - oNOuZSDPUAX len=0 
' 0018     24 LABEL : Cell Value, String Constant - OUQfTZoVp len=0 
' 0018     24 LABEL : Cell Value, String Constant - oWKyoRqFn len=0 
' 0018     25 LABEL : Cell Value, String Constant - YZtrMRCMSr 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 LABELSST
... (truncated)

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