Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3774e848497ddf26…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:41:29 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 0c0b8cb2b3e25262988235e762aada75 SHA-1: a16354b385e9b3a5643181d461f8158339ad2553 SHA-256: 3774e848497ddf26bba36a1bc83f12352111a0ab034bc8ebd45812efaf7a0369
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 defined name, which is a critical finding indicating potential malicious execution. The presence of dangerous formula APIs like RUN further supports this. The macro sheet is designed to execute arbitrary code upon opening, likely leading to further stages of an 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) 6647 bytes
SHA-256: 64a7e0436fa33ddb83c8842de9916d1d8c69eac75e5e6ce2e068d51f053d4da1
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  shgvXa
' 0018     27 LABEL : Cell Value, String Constant - ARbOoqEwWghq len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A141 
' 0018     23 LABEL : Cell Value, String Constant - BRYYgheG len=0 
' 0018     25 LABEL : Cell Value, String Constant - dgRRKmyspZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - ElIrlgTQt len=0 
' 0018     20 LABEL : Cell Value, String Constant - eMbkm len=0 
' 0018     25 LABEL : Cell Value, String Constant - EoDxXeVLgB len=0 
' 0018     21 LABEL : Cell Value, String Constant - LjfAuT len=0 
' 0018     27 LABEL : Cell Value, String Constant - lTUxwpzYcltj len=0 
' 0018     23 LABEL : Cell Value, String Constant - mdMAycfJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - naINWhUX len=0 
' 0018     22 LABEL : Cell Value, String Constant - PmFzQXh len=0 
' 0018     20 LABEL : Cell Value, String Constant - qzFfz len=0 
' 0018     20 LABEL : Cell Value, String Constant - shitM len=0 
' 0018     25 LABEL : Cell Value, String Constant - ThQHYhTuwe len=0 
' 0018     23 LABEL : Cell Value, String Constant - wBiOqjoC len=0 
' 0018     23 LABEL : Cell Value, String Constant - WSIweixM len=0 
' 0018     20 LABEL : Cell Value, String Constant - wuQSk len=0 
' 0018     21 LABEL : Cell Value, String Constant - XfEVus len=0 
' 0018     24 LABEL : Cell Value, String Constant - yDgnihDkd len=0 
' 0018     23 LABEL : Cell Value, String Constant - zGPMGSRj 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 LABELSS
... (truncated)

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