Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4df0b14ea92f077c…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:38:36 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: f8224f9a9bc6fa8d9aaeaa276a7c9e6b SHA-1: 88b704ad7a00f07000b9d921ad71c53041ac465d SHA-256: 4df0b14ea92f077c3c97915f0f8404aaa4c5153db89b799993f8f3f12207d12c
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a critical finding indicating potential for arbitrary code execution. The presence of dangerous formula APIs like RUN further supports this. The macro sheet itself contains obfuscated data that likely serves as a payload or configuration for the 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) 6571 bytes
SHA-256: d12c408ae31946cb4f86d97b7fa8ecca43f7b4426c365070d5027b16d585c122
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 -  jrxjzFKocg
' 0018     26 LABEL : Cell Value, String Constant - aqpKisOgJgI len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D140 
' 0018     27 LABEL : Cell Value, String Constant - bstJQeVJbTGm len=0 
' 0018     23 LABEL : Cell Value, String Constant - cJJaDLsg len=0 
' 0018     27 LABEL : Cell Value, String Constant - cWGlkHymMfJu len=0 
' 0018     21 LABEL : Cell Value, String Constant - FfgKYY len=0 
' 0018     21 LABEL : Cell Value, String Constant - HVdsjN len=0 
' 0018     23 LABEL : Cell Value, String Constant - KCXsWtRp len=0 
' 0018     21 LABEL : Cell Value, String Constant - lMrdwY len=0 
' 0018     22 LABEL : Cell Value, String Constant - mEIixWX len=0 
' 0018     24 LABEL : Cell Value, String Constant - mRSpyYxLB len=0 
' 0018     22 LABEL : Cell Value, String Constant - mwwgXRG len=0 
' 0018     23 LABEL : Cell Value, String Constant - nrNvGFNx len=0 
' 0018     20 LABEL : Cell Value, String Constant - pOCyN len=0 
' 0018     23 LABEL : Cell Value, String Constant - PQCOcHOf len=0 
' 0018     20 LABEL : Cell Value, String Constant - StWRs len=0 
' 0018     21 LABEL : Cell Value, String Constant - UcjkmG len=0 
' 0018     21 LABEL : Cell Value, String Constant - UCZPer len=0 
' 0018     25 LABEL : Cell Value, String Constant - vGIcQEpaWB len=0 
' 0018     23 LABEL : Cell Value, String Constant - VvpTDTvY len=0 
' 0018     25 LABEL : Cell Value, String Constant - wfuEXFFqaV 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 LABE
... (truncated)

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