Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6a6e59f78a2f3c9c…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:46:26 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 787435b8f731627842d245f0ad648142 SHA-1: 688402ce27c07e03929e2b26dd4899a55a6df840 SHA-256: 6a6e59f78a2f3c9ca9658b2efedabaf185ce099121f91dc99ec8780bd451b010
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known technique for executing malicious code. The presence of dangerous formula APIs like RUN suggests the macro is designed to perform actions beyond typical spreadsheet operations. While no specific URLs or hashes were extracted, the Auto_Open macro itself is the primary indicator of malicious intent, likely leading to the execution of 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) 6727 bytes
SHA-256: 625aed00d33d4112957b5580d58359adc35c76d31a6406d092661315636e3842
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  QkhCV
' 0018     22 LABEL : Cell Value, String Constant - AtKLnJg len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G199 
' 0018     24 LABEL : Cell Value, String Constant - aVpPQKpem len=0 
' 0018     25 LABEL : Cell Value, String Constant - CEHgYwWfkk len=0 
' 0018     23 LABEL : Cell Value, String Constant - elEqaNLT len=0 
' 0018     26 LABEL : Cell Value, String Constant - FRrnEYGqMdS len=0 
' 0018     20 LABEL : Cell Value, String Constant - fysuk len=0 
' 0018     25 LABEL : Cell Value, String Constant - GhTItKuoDN len=0 
' 0018     21 LABEL : Cell Value, String Constant - GptzuH len=0 
' 0018     23 LABEL : Cell Value, String Constant - hzNHSKfc len=0 
' 0018     25 LABEL : Cell Value, String Constant - jrsjBmcJmu len=0 
' 0018     23 LABEL : Cell Value, String Constant - ktqnjVXZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - mcTwa len=0 
' 0018     24 LABEL : Cell Value, String Constant - ofHkONaUv len=0 
' 0018     25 LABEL : Cell Value, String Constant - oshpjTzIvp len=0 
' 0018     21 LABEL : Cell Value, String Constant - qIKQCN len=0 
' 0018     21 LABEL : Cell Value, String Constant - quaXgz len=0 
' 0018     23 LABEL : Cell Value, String Constant - QXhhESNP len=0 
' 0018     20 LABEL : Cell Value, String Constant - SrEpx len=0 
' 0018     27 LABEL : Cell Value, String Constant - WJtWyqVjbOrk len=0 
' 0018     24 LABEL : Cell Value, String Constant - zKrtxPhgx 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 LABEL
... (truncated)

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