Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0577d346b779018c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:40:36 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 0211883d4acfbd07a872b43051058d49 SHA-1: 7062130ea268247c6b63461dde8e4f5b0b023945 SHA-256: 0577d346b779018c7776bd446e456801b87524f8a80cb5d70dcbe6deed786769
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 (XLM) macros. The presence of an 'Auto_Open' defined name indicates that these macros will execute automatically when the workbook is opened. The heuristics also indicate the use of dangerous formula APIs, suggesting the macros are intended to perform malicious actions, such as downloading and executing 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) 6873 bytes
SHA-256: bbdcfca7c55f801cb53d6606046ae02a5a9dce1c0446c67f8d0ac0134dedac6e
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 -  LUsvPjVCxty
' 0018     20 LABEL : Cell Value, String Constant - aDAej len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D135 
' 0018     21 LABEL : Cell Value, String Constant - BhRXrm len=0 
' 0018     22 LABEL : Cell Value, String Constant - BoOOIRl len=0 
' 0018     25 LABEL : Cell Value, String Constant - bwpZNwFOtH len=0 
' 0018     27 LABEL : Cell Value, String Constant - DqIEIoWTSvlT len=0 
' 0018     26 LABEL : Cell Value, String Constant - DxeePLpvoBP len=0 
' 0018     20 LABEL : Cell Value, String Constant - dYPfI len=0 
' 0018     22 LABEL : Cell Value, String Constant - EGqIgRX len=0 
' 0018     23 LABEL : Cell Value, String Constant - fnqVQetd len=0 
' 0018     26 LABEL : Cell Value, String Constant - HhEklLveBCu len=0 
' 0018     26 LABEL : Cell Value, String Constant - HtBhBGpaztd len=0 
' 0018     21 LABEL : Cell Value, String Constant - IpFTXX len=0 
' 0018     26 LABEL : Cell Value, String Constant - kLXCBLBqDUZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - MShkhhJBqE len=0 
' 0018     24 LABEL : Cell Value, String Constant - nGHhHRiwJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - tMqviLZUfuSu len=0 
' 0018     20 LABEL : Cell Value, String Constant - wnBzz len=0 
' 0018     26 LABEL : Cell Value, String Constant - WpqmVhPRoFp len=0 
' 0018     22 LABEL : Cell Value, String Constant - XiWCzgn len=0 
' 0018     26 LABEL : Cell Value, String Constant - zXkAnIxfNUL 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

... (truncated)

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