Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d080f1a42b91707f…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:34:22 Authoring application: Microsoft Excel First seen: 2021-10-11
MD5: 9821e95e523973d1c1a6b2f71933ac08 SHA-1: 99738c99f6da2567e0dd433f3d68f947a881d527 SHA-256: d080f1a42b91707f2f736d4c66f8af8edc8ab5dc206de8a1253b9cd3389da240
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 (XLM) macros with an Auto_Open entry, which is a common method for executing malicious code upon opening the workbook. The `RUN=0` formula API in the XLM macro suggests it is designed to execute an external command or download a payload. While no specific URLs or hashes were extracted, the technique strongly implies a downloader or initial execution stage.

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) 6538 bytes
SHA-256: ba958af9980a3b855ad0e58c4e35837d4eb627d9a3d4512495db5722407dffac
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  DJSxrA
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I176 
' 0018     23 LABEL : Cell Value, String Constant - bEuFiOfw len=0 
' 0018     26 LABEL : Cell Value, String Constant - DstbgFNENvc len=0 
' 0018     23 LABEL : Cell Value, String Constant - dtheoqRW len=0 
' 0018     26 LABEL : Cell Value, String Constant - fbfvlskKeee len=0 
' 0018     21 LABEL : Cell Value, String Constant - FkYwJx len=0 
' 0018     21 LABEL : Cell Value, String Constant - GHWjzh len=0 
' 0018     27 LABEL : Cell Value, String Constant - hycBWZeDkDAB len=0 
' 0018     23 LABEL : Cell Value, String Constant - JlsFInmK len=0 
' 0018     24 LABEL : Cell Value, String Constant - MlnLKCeWW len=0 
' 0018     20 LABEL : Cell Value, String Constant - mOgwE len=0 
' 0018     26 LABEL : Cell Value, String Constant - mzqrtTDzYGr len=0 
' 0018     27 LABEL : Cell Value, String Constant - NUCyLOOhHSaV len=0 
' 0018     24 LABEL : Cell Value, String Constant - PhfVEtZQS len=0 
' 0018     23 LABEL : Cell Value, String Constant - QCsfVcsk len=0 
' 0018     21 LABEL : Cell Value, String Constant - qtBLCB len=0 
' 0018     27 LABEL : Cell Value, String Constant - RopNWvtgqRdI len=0 
' 0018     23 LABEL : Cell Value, String Constant - tDUFTFGW len=0 
' 0018     20 LABEL : Cell Value, String Constant - TRcQO len=0 
' 0018     23 LABEL : Cell Value, String Constant - Vbvpgdys len=0 
' 0018     20 LABEL : Cell Value, String Constant - VhGeJ 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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