Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4462ef15c4f1a560…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:47 Authoring application: Microsoft Excel First seen: 2021-09-15
MD5: ce0f34a451afcd323c0d54e8487e0a47 SHA-1: c77da7d93fa82a4d4e60174c4c6f280b2a2fcfb1 SHA-256: 4462ef15c4f1a56056467efde11effada3c20c593a9a389cef993f3531937e9f
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 macros, specifically an Auto_Open function. This function is designed to execute arbitrary code upon opening the document, which is a common technique for delivering malicious payloads. The presence of dangerous formula APIs further indicates malicious intent.

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) 6561 bytes
SHA-256: 266420e4119744168ca409917b56a0112c33a7df59a64ce6e1aaa6a63acc4b43
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  vFLKiyksE
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C175 
' 0018     25 LABEL : Cell Value, String Constant - BAlmQKmBvS len=0 
' 0018     23 LABEL : Cell Value, String Constant - cETZTQZv len=0 
' 0018     23 LABEL : Cell Value, String Constant - DsPPwusG len=0 
' 0018     27 LABEL : Cell Value, String Constant - DyhUPCRzUjBl len=0 
' 0018     23 LABEL : Cell Value, String Constant - hDuVQzWn len=0 
' 0018     24 LABEL : Cell Value, String Constant - hRMGFLXTH len=0 
' 0018     21 LABEL : Cell Value, String Constant - HSpiei len=0 
' 0018     21 LABEL : Cell Value, String Constant - JGYjPG len=0 
' 0018     25 LABEL : Cell Value, String Constant - jKiGyCdTGh len=0 
' 0018     22 LABEL : Cell Value, String Constant - kLEeGqQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - lDwjUFpnBmh len=0 
' 0018     22 LABEL : Cell Value, String Constant - nDNzRhr len=0 
' 0018     25 LABEL : Cell Value, String Constant - nKUEpWkisB len=0 
' 0018     21 LABEL : Cell Value, String Constant - RCnQwf len=0 
' 0018     22 LABEL : Cell Value, String Constant - rEDjPva len=0 
' 0018     24 LABEL : Cell Value, String Constant - rpintqzQg len=0 
' 0018     23 LABEL : Cell Value, String Constant - RzgOCLbF len=0 
' 0018     21 LABEL : Cell Value, String Constant - SBDuJU len=0 
' 0018     27 LABEL : Cell Value, String Constant - SKqdKYwgxjpQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - YVhaSUm 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    
... (truncated)

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