Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4af75aab040b2eb4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:13 Authoring application: Microsoft Excel First seen: 2021-05-22
MD5: bcd2a595dccb54b7d5b7bedf6f4deaba SHA-1: ea6561d942f7270f3fb7b6c0dd03c7a2d5009bd7 SHA-256: 4af75aab040b2eb48950d54ed6556dafb9bd412b57bd4f7dc923c509901f809b
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a known method for executing malicious code upon opening the workbook. The macro sheet contains a dangerous formula API call, specifically 'RUN', suggesting it is designed to execute an external command or payload. No specific URLs or further script details were extracted to identify the payload or family.

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) 6533 bytes
SHA-256: 65642701febabb161da45c19830c970c22854dd3dd4c71b2d02d5e7d0866de23
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  NheJWdn
' 0018     23 LABEL : Cell Value, String Constant - AaCIXgpB len=0 
' 0018     22 LABEL : Cell Value, String Constant - AFOHPmP len=0 
' 0018     20 LABEL : Cell Value, String Constant - AnGLL len=0 
' 0018     20 LABEL : Cell Value, String Constant - AUCYO len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G183 
' 0018     23 LABEL : Cell Value, String Constant - cHYoZZQA len=0 
' 0018     22 LABEL : Cell Value, String Constant - eBUiYto len=0 
' 0018     24 LABEL : Cell Value, String Constant - iZsOioaTi len=0 
' 0018     20 LABEL : Cell Value, String Constant - KgMGP len=0 
' 0018     26 LABEL : Cell Value, String Constant - lsTIAAMyBgy len=0 
' 0018     22 LABEL : Cell Value, String Constant - nCXYRpT len=0 
' 0018     24 LABEL : Cell Value, String Constant - oiiDhdUoe len=0 
' 0018     20 LABEL : Cell Value, String Constant - pQpkl len=0 
' 0018     21 LABEL : Cell Value, String Constant - RBGwaH len=0 
' 0018     22 LABEL : Cell Value, String Constant - slnraMJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - TmvsDeBIDrUc len=0 
' 0018     20 LABEL : Cell Value, String Constant - twFJq len=0 
' 0018     26 LABEL : Cell Value, String Constant - vyVTneoqCkY len=0 
' 0018     26 LABEL : Cell Value, String Constant - WjWrcXkwAFD len=0 
' 0018     26 LABEL : Cell Value, String Constant - youUvHMXejF len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZhcHME 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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