Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 62805e1b349d5b0f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:35 Authoring application: Microsoft Excel First seen: 2021-11-03
MD5: 2c6b62fc32b106bcb694511cb49e0abe SHA-1: bbf8132585d0ff1e7d2b91cd591f841032bc534c SHA-256: 62805e1b349d5b0fc48e6ac5ca9cd6a18cf1655f43156b794da1a01c50591135
140 Risk Score

Malware Insights

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

The file contains critical Excel 4.0 (XLM) macros, including an Auto_Open entry, which is a strong indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely downloading and running a second-stage payload. No specific family could be identified.

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) 6751 bytes
SHA-256: 5537d503e0cfd9139d260b976fdbf1c7b78395e355f538e2c409dfd99af1ebaf
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 -  KzuzythxN
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A148 
' 0018     21 LABEL : Cell Value, String Constant - BwczaK len=0 
' 0018     22 LABEL : Cell Value, String Constant - DGBEKtM len=0 
' 0018     22 LABEL : Cell Value, String Constant - frVuGqQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - gObVDop len=0 
' 0018     20 LABEL : Cell Value, String Constant - IwxKf len=0 
' 0018     21 LABEL : Cell Value, String Constant - jAFVWk len=0 
' 0018     21 LABEL : Cell Value, String Constant - MFDuKe len=0 
' 0018     27 LABEL : Cell Value, String Constant - mZLPmwhSFpXp len=0 
' 0018     26 LABEL : Cell Value, String Constant - NotwDejhaMD len=0 
' 0018     25 LABEL : Cell Value, String Constant - NToCUnfgyg len=0 
' 0018     21 LABEL : Cell Value, String Constant - OEhpbv len=0 
' 0018     25 LABEL : Cell Value, String Constant - qJJqxXMHrf len=0 
' 0018     23 LABEL : Cell Value, String Constant - rMsQQCoF len=0 
' 0018     25 LABEL : Cell Value, String Constant - SLUwJTndRy len=0 
' 0018     27 LABEL : Cell Value, String Constant - SMNHzGhFxBBh len=0 
' 0018     22 LABEL : Cell Value, String Constant - UddXyXm len=0 
' 0018     23 LABEL : Cell Value, String Constant - UuoITshm len=0 
' 0018     24 LABEL : Cell Value, String Constant - VjKVxgsUC len=0 
' 0018     20 LABEL : Cell Value, String Constant - XiSFg len=0 
' 0018     20 LABEL : Cell Value, String Constant - XxNxa 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 LABELS
... (truncated)

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