Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7f7e170232e74042…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:37 Authoring application: Microsoft Excel First seen: 2021-05-26
MD5: e73fd55d1077c72ba0bd619a16f84606 SHA-1: 7ed4f8896f0a54e480e32615a2ee61fb1d3c1a94 SHA-256: 7f7e170232e74042f9cdb9a9edcbfd9d1f478195656d004afc0fd811b526a399
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 defined name, which is a critical finding indicating potential malicious execution. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. While no specific URLs or further payloads were extracted, the Auto_Open macro is a strong indicator of malicious intent, likely to download and execute a second-stage payload.

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) 6893 bytes
SHA-256: e44ef53273ce69e526d43685312d1e6e01b11b33bd0c56f7abf0e0e4683541aa
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  XhdRIHErD
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F168 
' 0018     23 LABEL : Cell Value, String Constant - avVsDZWI len=0 
' 0018     27 LABEL : Cell Value, String Constant - dNMRGGEVzrcA len=0 
' 0018     21 LABEL : Cell Value, String Constant - iynRhD len=0 
' 0018     22 LABEL : Cell Value, String Constant - jBaewmc len=0 
' 0018     22 LABEL : Cell Value, String Constant - JDkaJzg len=0 
' 0018     27 LABEL : Cell Value, String Constant - kkNIgqTiZtOb len=0 
' 0018     22 LABEL : Cell Value, String Constant - LxbQFeZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - lYtyVpo len=0 
' 0018     20 LABEL : Cell Value, String Constant - mCTmv len=0 
' 0018     24 LABEL : Cell Value, String Constant - MOYdlPjxe len=0 
' 0018     23 LABEL : Cell Value, String Constant - MwGLmNKx len=0 
' 0018     23 LABEL : Cell Value, String Constant - ndopmNYh len=0 
' 0018     20 LABEL : Cell Value, String Constant - nRcDm len=0 
' 0018     26 LABEL : Cell Value, String Constant - nUrVYVSCEOC len=0 
' 0018     20 LABEL : Cell Value, String Constant - PkbqI len=0 
' 0018     26 LABEL : Cell Value, String Constant - RagOaenBCqv len=0 
' 0018     25 LABEL : Cell Value, String Constant - roMToJmPaj len=0 
' 0018     27 LABEL : Cell Value, String Constant - RUortKgOzUZt len=0 
' 0018     25 LABEL : Cell Value, String Constant - uFLYbaNURy len=0 
' 0018     20 LABEL : Cell Value, String Constant - yyxNh 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     1
... (truncated)

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