Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 156ff2a002cbf437…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:10 Authoring application: Microsoft Excel First seen: 2021-10-11
MD5: 80a88c33fd0a9103603f315676b5543c SHA-1: 58a2bc0a40582f4d375764ced289f0fb81405070 SHA-256: 156ff2a002cbf437febde659aa0a7fc64469dc82f06319b0940f5e9fcfeeab84
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open function, which is a common method for executing malicious code upon opening the document. The `XLM_DANGEROUS_FN` firing suggests the use of risky functions within the macro, likely to download and execute a payload. No specific IOCs like URLs or hashes were extracted from the macro itself.

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: 54344b33763490e4a55370f21f355f23419edafe8761a7cccc09450d905a2824
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  LrTnTijCsO
' 0018     26 LABEL : Cell Value, String Constant - aEQivWHNzyz len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H145 
' 0018     24 LABEL : Cell Value, String Constant - bNpnMBDKr len=0 
' 0018     22 LABEL : Cell Value, String Constant - BYCIUgc len=0 
' 0018     22 LABEL : Cell Value, String Constant - CqdrkQI len=0 
' 0018     24 LABEL : Cell Value, String Constant - epVFjvLwo len=0 
' 0018     22 LABEL : Cell Value, String Constant - fChuMQL len=0 
' 0018     22 LABEL : Cell Value, String Constant - FJscwEd len=0 
' 0018     23 LABEL : Cell Value, String Constant - gFEacdPe len=0 
' 0018     24 LABEL : Cell Value, String Constant - hRTOlHkhg len=0 
' 0018     24 LABEL : Cell Value, String Constant - KDJZUWTLu len=0 
' 0018     25 LABEL : Cell Value, String Constant - KxRVsnzESd len=0 
' 0018     24 LABEL : Cell Value, String Constant - LixjHqije len=0 
' 0018     27 LABEL : Cell Value, String Constant - MasJgBfEGiUX len=0 
' 0018     23 LABEL : Cell Value, String Constant - MeYrCXTl len=0 
' 0018     27 LABEL : Cell Value, String Constant - NvhaiSYOYyqr len=0 
' 0018     25 LABEL : Cell Value, String Constant - PomtAtgLED len=0 
' 0018     21 LABEL : Cell Value, String Constant - rsAeBp len=0 
' 0018     26 LABEL : Cell Value, String Constant - TiSiRXftAot len=0 
' 0018     26 LABEL : Cell Value, String Constant - vGekdrthYYf len=0 
' 0018     24 LABEL : Cell Value, String Constant - zpQYgrYAn 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/
... (truncated)

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