Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e25f318ea0870b73…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:49 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 7331e3343ee1aa190af355b7b792967d SHA-1: e0f4d3781286bbafc00337a0d6c0bc933f48ea7c SHA-256: e25f318ea0870b73f2d9fbd8a673be6b6e3116e3bd350e654010363a9b24c0a9
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 entry, suggesting an attempt to automatically execute code. The 'RUN' function API was identified, which is often used to launch external processes or scripts. While no specific URLs or further payloads were extracted, the Auto_Open macro is a strong indicator of malicious intent for initial execution.

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) 6633 bytes
SHA-256: 7dabd2d14c6ee75f97a645a3221ca0dfb7239f6007c5303dc3d02bc6e4281810
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  foum
' 0018     22 LABEL : Cell Value, String Constant - aNfcPQB len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E179 
' 0018     26 LABEL : Cell Value, String Constant - dOAxPpYYsEo len=0 
' 0018     22 LABEL : Cell Value, String Constant - DRxlOYr len=0 
' 0018     21 LABEL : Cell Value, String Constant - EJbAYG len=0 
' 0018     23 LABEL : Cell Value, String Constant - GWEDcrKM len=0 
' 0018     21 LABEL : Cell Value, String Constant - gZpMAF len=0 
' 0018     22 LABEL : Cell Value, String Constant - hGfPdZY len=0 
' 0018     20 LABEL : Cell Value, String Constant - HtzCn len=0 
' 0018     27 LABEL : Cell Value, String Constant - mLvlIDuBPWBg len=0 
' 0018     20 LABEL : Cell Value, String Constant - mZcCV len=0 
' 0018     22 LABEL : Cell Value, String Constant - PzsEwQU len=0 
' 0018     25 LABEL : Cell Value, String Constant - qiUUCJpmrl len=0 
' 0018     21 LABEL : Cell Value, String Constant - RuvKbE len=0 
' 0018     27 LABEL : Cell Value, String Constant - ShClXCamTFQO len=0 
' 0018     24 LABEL : Cell Value, String Constant - SWrCBFHuV len=0 
' 0018     23 LABEL : Cell Value, String Constant - VEQwJGdv len=0 
' 0018     21 LABEL : Cell Value, String Constant - wGXqaz len=0 
' 0018     26 LABEL : Cell Value, String Constant - wHcfTxxYXKO len=0 
' 0018     21 LABEL : Cell Value, String Constant - wQbHet len=0 
' 0018     22 LABEL : Cell Value, String Constant - YcKOvVV 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 : C
... (truncated)

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