Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 be5cd9bc9bb196f6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:33:00 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 84399291042310273b5c84e63bcc60f1 SHA-1: f65a11ddb4631f0a17c156afbdb13054e48f3619 SHA-256: be5cd9bc9bb196f6719ee1f85af358e7c9143fd051932c2688af2080beded7b4
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the workbook. The macro sheet contains references to dangerous formula APIs, suggesting it's designed to run arbitrary commands.

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) 6397 bytes
SHA-256: e3dad538ae719197aacdbebcf0ffd5f18003f0737197fea21779c402c286830b
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 -  TpP
' 0018     24 LABEL : Cell Value, String Constant - aLnSoCeJk len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D151 
' 0018     21 LABEL : Cell Value, String Constant - BPVJcL len=0 
' 0018     20 LABEL : Cell Value, String Constant - bWXzL len=0 
' 0018     22 LABEL : Cell Value, String Constant - cFkWPnK len=0 
' 0018     20 LABEL : Cell Value, String Constant - CgWqS len=0 
' 0018     22 LABEL : Cell Value, String Constant - DfcbKhS len=0 
' 0018     26 LABEL : Cell Value, String Constant - DnfkeKUNIcb len=0 
' 0018     24 LABEL : Cell Value, String Constant - eoWRwEocf len=0 
' 0018     27 LABEL : Cell Value, String Constant - GPlgTLjCcLHD len=0 
' 0018     23 LABEL : Cell Value, String Constant - gvqHMZWV len=0 
' 0018     21 LABEL : Cell Value, String Constant - JTgkgo len=0 
' 0018     22 LABEL : Cell Value, String Constant - mIApREV len=0 
' 0018     25 LABEL : Cell Value, String Constant - msCfKtnEMY len=0 
' 0018     24 LABEL : Cell Value, String Constant - nltdyVmcJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - NNoybhIpR len=0 
' 0018     25 LABEL : Cell Value, String Constant - NYIrmXvSDF len=0 
' 0018     20 LABEL : Cell Value, String Constant - qYsyW len=0 
' 0018     24 LABEL : Cell Value, String Constant - vxQcvDuft len=0 
' 0018     25 LABEL : Cell Value, String Constant - WgaZzINNMM len=0 
' 0018     21 LABEL : Cell Value, String Constant - xBjgYi 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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