Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3fcd81d58d637015…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:46 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 3f79e2c13b2f32dd75947ea84624eea4 SHA-1: d0651fb15ceb5652de0f1b9c5be5a39e11a7ad30 SHA-256: 3fcd81d58d637015e3c366cfc4fc3c76c69b72f98441bce3ade6ed2d53fc8c7b
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 macro, which is a common technique for executing malicious code upon opening the document. The macro sheet contains references to dangerous formula APIs, including RUN, suggesting it is designed to execute arbitrary commands or download additional payloads. No specific URLs or hashes were extracted, but the Auto_Open functionality is a high-confidence indicator of malicious intent.

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) 6513 bytes
SHA-256: 070e4b3523af532f68c14beade40fcdbc838625fdfe7319352393865b546d1c1
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  cPrjf
' 0018     22 LABEL : Cell Value, String Constant - AiZCGtd len=0 
' 0018     23 LABEL : Cell Value, String Constant - AQbkljjv len=0 
' 0018     23 LABEL : Cell Value, String Constant - AQoTRyEs len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F171 
' 0018     23 LABEL : Cell Value, String Constant - cgCEeCzQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - EMqAyeLkaGWp len=0 
' 0018     23 LABEL : Cell Value, String Constant - jTLhgZsD len=0 
' 0018     24 LABEL : Cell Value, String Constant - lRPUsgShi len=0 
' 0018     21 LABEL : Cell Value, String Constant - mCpXom len=0 
' 0018     22 LABEL : Cell Value, String Constant - MQYujqh len=0 
' 0018     25 LABEL : Cell Value, String Constant - MZFWTgMict len=0 
' 0018     25 LABEL : Cell Value, String Constant - qPxpSKlqnH len=0 
' 0018     22 LABEL : Cell Value, String Constant - qwCrxxF len=0 
' 0018     23 LABEL : Cell Value, String Constant - rSHTGsWc len=0 
' 0018     21 LABEL : Cell Value, String Constant - szahiL len=0 
' 0018     24 LABEL : Cell Value, String Constant - TTOGKTGYe len=0 
' 0018     26 LABEL : Cell Value, String Constant - uRPjARJHhYy len=0 
' 0018     21 LABEL : Cell Value, String Constant - UVXEJw len=0 
' 0018     26 LABEL : Cell Value, String Constant - wmBCzOCFnEr len=0 
' 0018     27 LABEL : Cell Value, String Constant - xVnotFBVnoFT len=0 
' 0018     27 LABEL : Cell Value, String Constant - YgRlmxSkEIcs 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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