Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7373c7f746f41b59…

MALICIOUS

Office (OLE)

116.0 KB Created: 2007-02-07 03:01:59 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 284ae70c2476141e6aac7470aac0e6be SHA-1: 05ac05d2af8ffb45d9011502774355d112622357 SHA-256: 7373c7f746f41b598dedbbc1da79a23e8f9a788d6819454565e35bf8f68f26dd
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open macro, which is a common technique for executing malicious code upon opening. Heuristics indicate the use of dangerous formula APIs within the macro. The document body presents a social engineering lure to enable content, suggesting the intent is to execute the macro and download a secondary payload.

Heuristics 4

  • ClamAV: Xls.Dropper.Agent-8656883-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8656883-0
  • 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) 54121 bytes
SHA-256: 08c86683edb36da97c780375073637cdb37282d3e6b33b6879d4b0666b14971b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     26 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  cpBmLgp2XHQOJLaUq
' 0018     18 LABEL : Cell Value, String Constant - aeH len=0 
' 0018     19 LABEL : Cell Value, String Constant - AroA len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d  Sheet!CE13191 
' 0018     19 LABEL : Cell Value, String Constant - bOtE len=0 
' 0018     20 LABEL : Cell Value, String Constant - cFSqC len=0 
' 0018     19 LABEL : Cell Value, String Constant - Cibp len=0 
' 0018     20 LABEL : Cell Value, String Constant - CphRd len=0 
' 0018     20 LABEL : Cell Value, String Constant - daenE len=0 
' 0018     18 LABEL : Cell Value, String Constant - daQ len=0 
' 0018     19 LABEL : Cell Value, String Constant - DBnm len=0 
' 0018     21 LABEL : Cell Value, String Constant - DIdmaR len=0 
' 0018     21 LABEL : Cell Value, String Constant - DQiofn len=0 
' 0018     19 LABEL : Cell Value, String Constant - dQQc len=0 
' 0018     21 LABEL : Cell Value, String Constant - eSsOCa len=0 
' 0018     19 LABEL : Cell Value, String Constant - eUNl len=0 
' 0018     18 LABEL : Cell Value, String Constant - eVi len=0 
' 0018     20 LABEL : Cell Value, String Constant - fGiLx len=0 
' 0018     18 LABEL : Cell Value, String Constant - fGS len=0 
' 0018     20 LABEL : Cell Value, String Constant - fpdvs len=0 
' 0018     20 LABEL : Cell Value, String Constant - FRaZp len=0 
' 0018     18 LABEL : Cell Value, String Constant - GAO len=0 
' 0018     20 LABEL : Cell Value, String Constant - GBxhH len=0 
' 0018     19 LABEL : Cell Value, String Constant - GNVO len=0 
' 0018     20 LABEL : Cell Value, String Constant - gYIDq len=0 
' 0018     18 LABEL : Cell Value, String Constant - HkI len=0 
' 0018     18 LABEL : Cell Value, String Constant - HRs len=0 
' 0018     19 LABEL : Cell Value, String Constant - hRZS len=0 
' 0018     18 LABEL : Cell Value, String Constant - IoI len=0 
' 0018     21 LABEL : Cell Value, String Constant - IYVleJ len=0 
' 0018     18 LABEL : Cell Value, String Constant - jfT len=0 
' 0018     19 LABEL : Cell Value, String Constant - JGpR len=0 
' 0018     21 LABEL : Cell Value, String Constant - jkoacF len=0 
' 0018     19 LABEL : Cell Value, String Constant - jOfm len=0 
' 0018     20 LABEL : Cell Value, String Constant - kmvSQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - KUPFBL len=0 
' 0018     18 LABEL : Cell Value, String Constant - KUs len=0 
' 0018     20 LABEL : Cell Value, String Constant - mMKup len=0 
' 0018     19 LABEL : Cell Value, String Constant - mqEI len=0 
' 0018     20 LABEL : Cell Value, String Constant - MtOde len=0 
' 0018     19 LABEL : Cell Value, String Constant - NRXm len=0 
' 0018     20 LABEL : Cell Value, String Constant - oaWEW len=0 
' 0018     20 LABEL : Cell Value, String Constant - okmKw len=0 
' 0018     19 LABEL : Cell Value, String Constant - OkUS len=0 
' 0018     19 LABEL : Cell Value, String Constant - phCn len=0 
' 0018     21 LABEL : Cell Value, String Constant - PRanUZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - qHhiH len=0 
' 0018     21 LABEL : Cell Value, String Constant - qYfsLe len=0 
' 0018     21 LABEL : Cell Value, String Constant - RFSRpv len=0 
' 0018     19 LABEL : Cell Value, String Constant - rGDI len=0 
' 0018     35 LABEL : Cell Value, String Constant -           hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00D\x1a\x94\x1a\x1f\x00\x1f\x00'
' 0018     18 LABEL : Cell Value, String Constant - RwS len=0 
' 0018     20 LABEL : Cell Value, String Constant - RZBup len=0 
' 0018     18 LABEL : Cell Value, String Constant - saY len=0 
' 0018     19 LABEL : Cell Value, String Constant - SeJZ len=0 
' 0018     18 LABEL : Cell Value, String Constant - SnN len=0 
' 0018     35 LABEL : Cell Value, String Constant -           hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00H\xf8g\xf8s\x00s\x00'
' 0018   
... (truncated)

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