Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 aa66a61283f61c2d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:10 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 29149c4bd11793601e5ce26d8b43ad98 SHA-1: 3166e312e4b16210aae50adb611296d6bd1d5078 SHA-256: aa66a61283f61c2dc9cc5ea282207f66b2387a1b54bacf8ee214e2edd83026fe
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 entry, which is a known method for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands or download further payloads. Without further deobfuscation or network analysis, the exact payload and destination remain unknown.

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) 6645 bytes
SHA-256: 85fb5cb5ac553851a96c5772554629fb8ecc3ac23beb8168552772264e7cfd22
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ahgHNuuxVmY
' 0018     24 LABEL : Cell Value, String Constant - AeLivFkSw len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I152 
' 0018     20 LABEL : Cell Value, String Constant - BFkrg len=0 
' 0018     26 LABEL : Cell Value, String Constant - cvHciUKDsTv len=0 
' 0018     23 LABEL : Cell Value, String Constant - EruAxmSG len=0 
' 0018     22 LABEL : Cell Value, String Constant - fmLuJxv len=0 
' 0018     25 LABEL : Cell Value, String Constant - FOmfpRWDaa len=0 
' 0018     24 LABEL : Cell Value, String Constant - GgVyxANTa len=0 
' 0018     20 LABEL : Cell Value, String Constant - glwFy len=0 
' 0018     23 LABEL : Cell Value, String Constant - gvuQZDGn len=0 
' 0018     22 LABEL : Cell Value, String Constant - hJbwGgK len=0 
' 0018     22 LABEL : Cell Value, String Constant - hxMMaBm len=0 
' 0018     25 LABEL : Cell Value, String Constant - icDffhargi len=0 
' 0018     27 LABEL : Cell Value, String Constant - iDyCTeoZcDcP len=0 
' 0018     25 LABEL : Cell Value, String Constant - kCmEHJLaDc len=0 
' 0018     26 LABEL : Cell Value, String Constant - MhksBLdDIwO len=0 
' 0018     22 LABEL : Cell Value, String Constant - OVtpKlZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - sKiQeWDu len=0 
' 0018     20 LABEL : Cell Value, String Constant - TmuGG len=0 
' 0018     27 LABEL : Cell Value, String Constant - TSBaQCmFOagr len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZptpMv 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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