Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d348fe9e63808ad2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:34 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 66b7b710f0fbff33b0292e66e4c1d438 SHA-1: 92032d012862f767f26947de967ad37b006d2bda SHA-256: d348fe9e63808ad2b84e3a54cace1d1b2ee6c95e9192d08094abce16778420de
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macro sheets with an Auto_Open defined name, indicating automatic execution upon opening. Critical heuristics identified dangerous formula APIs like RUN=0, suggesting the macro is designed to execute arbitrary code. The presence of XLM macros points to a downloader or initial execution stage for a more complex attack.

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) 6386 bytes
SHA-256: 69a381ffa292eaaff0dad25299786bbe3a7af008948af851872c7b347d54652f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Agy
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D168 
' 0018     27 LABEL : Cell Value, String Constant - DeHeKweZDvRd len=0 
' 0018     23 LABEL : Cell Value, String Constant - fBCWnZkP len=0 
' 0018     20 LABEL : Cell Value, String Constant - fOaKS len=0 
' 0018     24 LABEL : Cell Value, String Constant - IpDIdBcza len=0 
' 0018     26 LABEL : Cell Value, String Constant - iQoGAUbjbTv len=0 
' 0018     21 LABEL : Cell Value, String Constant - JgmwhT len=0 
' 0018     26 LABEL : Cell Value, String Constant - jQDbgtaOmpB len=0 
' 0018     22 LABEL : Cell Value, String Constant - MaFFTlE len=0 
' 0018     24 LABEL : Cell Value, String Constant - OLFoNoYmX len=0 
' 0018     24 LABEL : Cell Value, String Constant - pUvxkzLdw len=0 
' 0018     26 LABEL : Cell Value, String Constant - QWaTGgdGWpM len=0 
' 0018     23 LABEL : Cell Value, String Constant - sgmpzSfh len=0 
' 0018     27 LABEL : Cell Value, String Constant - TbPwhSnjRBlF len=0 
' 0018     22 LABEL : Cell Value, String Constant - vGVwFtl len=0 
' 0018     23 LABEL : Cell Value, String Constant - wbZpbntR len=0 
' 0018     21 LABEL : Cell Value, String Constant - WLfCtM len=0 
' 0018     23 LABEL : Cell Value, String Constant - wtgsTkyJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - xqSnZSI len=0 
' 0018     27 LABEL : Cell Value, String Constant - ztpazCYPCaGN len=0 
' 0018     20 LABEL : Cell Value, String Constant - zuGCs 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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