Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1d219f5b5d932650…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:32 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 6db027bdf0dd1f4a1c80cf10dfdf83f8 SHA-1: 9fab2652af8926cacc899662663975f00dbbef11 SHA-256: 1d219f5b5d9326504a5a37613038c3af94525bb62b579ca6b2170260af83ceba
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 containing an Auto_Open function, which is a critical finding indicating potential malicious execution. The presence of dangerous formula APIs within the Auto_Open macro suggests it is designed to execute arbitrary code, likely for downloading and running a secondary payload. No specific IOCs like URLs or hashes were extracted from the macro content 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) 6578 bytes
SHA-256: 550f247888e9b3ea7bfb487d1e92559a2c40585b573184d5a6941b7d24485dfa
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  sRllJjMN
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I170 
' 0018     25 LABEL : Cell Value, String Constant - fwANGjchmk len=0 
' 0018     23 LABEL : Cell Value, String Constant - HqgYdDZX len=0 
' 0018     27 LABEL : Cell Value, String Constant - IhZBbDPaZASX len=0 
' 0018     25 LABEL : Cell Value, String Constant - jYmddotBEa len=0 
' 0018     25 LABEL : Cell Value, String Constant - LNucHqlWaW len=0 
' 0018     23 LABEL : Cell Value, String Constant - MAJPKXHD len=0 
' 0018     24 LABEL : Cell Value, String Constant - mwJaHJuqb len=0 
' 0018     23 LABEL : Cell Value, String Constant - NKEtklyZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - NMHvzZj len=0 
' 0018     26 LABEL : Cell Value, String Constant - nRTCcbJXjIY len=0 
' 0018     27 LABEL : Cell Value, String Constant - sFsJitEGBYOB len=0 
' 0018     26 LABEL : Cell Value, String Constant - UCazTuVaZdn len=0 
' 0018     21 LABEL : Cell Value, String Constant - VACXAV len=0 
' 0018     21 LABEL : Cell Value, String Constant - wrYAnY len=0 
' 0018     21 LABEL : Cell Value, String Constant - wZEAoC len=0 
' 0018     25 LABEL : Cell Value, String Constant - YfoubYkEcc len=0 
' 0018     26 LABEL : Cell Value, String Constant - YNtIPCoLhsa len=0 
' 0018     23 LABEL : Cell Value, String Constant - YrMssSWQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - zmeNsecyzM len=0 
' 0018     23 LABEL : Cell Value, String Constant - zWsDDYxf 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/ S
... (truncated)

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