Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4b223801a1c8b732…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:26 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 840b5a502a9ae0f8ec7912413f27516e SHA-1: 9e93b8e955488550a757bb7e93718a7cc5bbd3a0 SHA-256: 4b223801a1c8b732a09dd1c7cf3d036a3167145f3360d85f74072d50b2d5d3aa
140 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled document. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon file opening. The macro likely attempts to download and execute a second-stage payload, though the specific URLs or commands are not directly extractable from the provided evidence.

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) 6373 bytes
SHA-256: ee8ac83848b921666356c554bbfebe62d7f1c802744b90b3c1790de53b1851bc
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  CRL
' 0018     20 LABEL : Cell Value, String Constant - anLun len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F137 
' 0018     25 LABEL : Cell Value, String Constant - AZKpksiObC len=0 
' 0018     26 LABEL : Cell Value, String Constant - bJoSYQfTldj len=0 
' 0018     24 LABEL : Cell Value, String Constant - dCLzruqFO len=0 
' 0018     26 LABEL : Cell Value, String Constant - dPpsgHoSQVF len=0 
' 0018     24 LABEL : Cell Value, String Constant - fHnrdYHaK len=0 
' 0018     21 LABEL : Cell Value, String Constant - GQoteu len=0 
' 0018     24 LABEL : Cell Value, String Constant - iTKpXNvol len=0 
' 0018     24 LABEL : Cell Value, String Constant - jKoaMnFCm len=0 
' 0018     21 LABEL : Cell Value, String Constant - jTPevJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - kbvkRhXYS len=0 
' 0018     22 LABEL : Cell Value, String Constant - LkegLhJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - LojpUUg len=0 
' 0018     22 LABEL : Cell Value, String Constant - MjtqDHJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - rBTUyvqcTxg len=0 
' 0018     24 LABEL : Cell Value, String Constant - RLdewrxur len=0 
' 0018     23 LABEL : Cell Value, String Constant - uxpqvjyz len=0 
' 0018     24 LABEL : Cell Value, String Constant - VDsTUyslx len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZhnvNjLW len=0 
' 0018     25 LABEL : Cell Value, String Constant - zwnirTLLXu 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
... (truncated)

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