Resubmissions

01-02-2023 17:02

230201-vj6p3aah39 10

01-02-2023 17:00

230201-vjf5eacg4s 10

01-02-2023 16:57

230201-vgbrxacg2y 10

Analysis

  • max time kernel
    153s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01-02-2023 17:00

General

  • Target

    Halkbank_Ekstre_20230129_075423_612150o.pdf..exe

  • Size

    461KB

  • MD5

    51505dd088beb3a3406dab4bcfc0090b

  • SHA1

    7efb628f6b348b0f19360241f3f0661419617bc7

  • SHA256

    5f16e8c1fef7f5f311b814b10f7b9e9b1ec3c204075fb8bb48ac207e256ea208

  • SHA512

    dc05dc73895114c6025c986d696a3a6044c26f2e6e2c5863c33a7806461033f99ae2dbae153cdf1c1d2b93ee9686bddf98d2b58759e13aef923dbf0635e3166c

  • SSDEEP

    12288:GENN+T5xYrllrU7QY62YrTNbwcD/xtDmpfJuB3:K5xolYQY62YrZ0nfs5

Malware Config

Signatures

  • Modifies WinLogon for persistence 2 TTPs 2 IoCs
  • Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs
  • Snake Keylogger

    Keylogger and Infostealer first seen in November 2020.

  • Snake Keylogger payload 1 IoCs
  • Executes dropped EXE 8 IoCs
  • Modifies Installed Components in the registry 2 TTPs 8 IoCs
  • UPX packed file 1 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Reads data files stored by FTP clients 2 TTPs

    Tries to access configuration files associated with programs like FileZilla.

  • Reads user/profile data of local email clients 2 TTPs

    Email clients store some user data on disk where infostealers will often target it.

  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
  • Adds Run key to start application 2 TTPs 6 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of SetThreadContext 1 IoCs
  • Drops file in Windows directory 6 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 2 IoCs
  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 14 IoCs
  • Suspicious use of WriteProcessMemory 34 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Halkbank_Ekstre_20230129_075423_612150o.pdf..exe
    "C:\Users\Admin\AppData\Local\Temp\Halkbank_Ekstre_20230129_075423_612150o.pdf..exe"
    1⤵
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:904
    • \??\c:\users\admin\appdata\local\temp\halkbank_ekstre_20230129_075423_612150o.pdf..exe 
      c:\users\admin\appdata\local\temp\halkbank_ekstre_20230129_075423_612150o.pdf..exe 
      2⤵
      • Executes dropped EXE
      • Suspicious use of WriteProcessMemory
      PID:3608
      • C:\Users\Admin\AppData\Local\Temp\iauwp.exe
        "C:\Users\Admin\AppData\Local\Temp\iauwp.exe" C:\Users\Admin\AppData\Local\Temp\iqvpwdmb.c
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious behavior: MapViewOfSection
        • Suspicious use of WriteProcessMemory
        PID:5068
        • C:\Users\Admin\AppData\Local\Temp\iauwp.exe
          "C:\Users\Admin\AppData\Local\Temp\iauwp.exe"
          4⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Suspicious use of AdjustPrivilegeToken
          • outlook_office_path
          • outlook_win_path
          PID:1128
    • C:\Users\Admin\AppData\Local\icsys.icn.exe
      C:\Users\Admin\AppData\Local\icsys.icn.exe
      2⤵
      • Executes dropped EXE
      • Drops file in Windows directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4996
      • \??\c:\windows\system\explorer.exe
        c:\windows\system\explorer.exe
        3⤵
        • Modifies WinLogon for persistence
        • Modifies visiblity of hidden/system files in Explorer
        • Executes dropped EXE
        • Modifies Installed Components in the registry
        • Adds Run key to start application
        • Drops file in Windows directory
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:5044
        • \??\c:\windows\system\spoolsv.exe
          c:\windows\system\spoolsv.exe SE
          4⤵
          • Executes dropped EXE
          • Drops file in Windows directory
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:4912
          • \??\c:\windows\system\svchost.exe
            c:\windows\system\svchost.exe
            5⤵
            • Modifies WinLogon for persistence
            • Modifies visiblity of hidden/system files in Explorer
            • Executes dropped EXE
            • Modifies Installed Components in the registry
            • Adds Run key to start application
            • Drops file in Windows directory
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious behavior: GetForegroundWindowSpam
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:1880
            • \??\c:\windows\system\spoolsv.exe
              c:\windows\system\spoolsv.exe PR
              6⤵
              • Executes dropped EXE
              • Suspicious use of SetWindowsHookEx
              PID:1800
            • C:\Windows\SysWOW64\at.exe
              at 18:04 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
              6⤵
                PID:2128
              • C:\Windows\SysWOW64\at.exe
                at 18:05 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
                6⤵
                  PID:2472
                • C:\Windows\SysWOW64\at.exe
                  at 18:06 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
                  6⤵
                    PID:2808

        Network

        MITRE ATT&CK Matrix ATT&CK v6

        Persistence

        Winlogon Helper DLL

        1
        T1004

        Hidden Files and Directories

        1
        T1158

        Registry Run Keys / Startup Folder

        2
        T1060

        Defense Evasion

        Modify Registry

        4
        T1112

        Hidden Files and Directories

        1
        T1158

        Credential Access

        Credentials in Files

        3
        T1081

        Discovery

        System Information Discovery

        1
        T1082

        Collection

        Data from Local System

        3
        T1005

        Email Collection

        1
        T1114

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\Local\Temp\halkbank_ekstre_20230129_075423_612150o.pdf..exe 
          Filesize

          187KB

          MD5

          c742b622a88a10779fe1673d751dc622

          SHA1

          2e1de5d8dbe6ade1af87ce06c31172d8c0a9baa8

          SHA256

          480fb8507176e7ab166f14cdc41e7d2d887555a8327800e989a5b07ec4ac7a2b

          SHA512

          c639ad738805b21617169a34da91fbba7a2b3a296e87cde799c2bda0f169742e8842160dd2bb89da37cdecdd2b17713165e33383e9f92179f5df2624c9bb4e96

        • C:\Users\Admin\AppData\Local\Temp\iauwp.exe
          Filesize

          80KB

          MD5

          82d9274bf661ed3fdb3d7e7d66efb9ba

          SHA1

          5f98a0699b92d2db63e4baa3c71920561bc49838

          SHA256

          306c0a2b8efa7c76f69246bed00e98b1d8c012446abdf48f650d9d7343562c34

          SHA512

          caf704dc43e4976a15a0bccb3ac6a7501d07c6d3855b6b3a1c9a69e1a6e3402548d61119229cdb34526a574cb44b988ac409155e1e308cf87112590aa10228f3

        • C:\Users\Admin\AppData\Local\Temp\iauwp.exe
          Filesize

          80KB

          MD5

          82d9274bf661ed3fdb3d7e7d66efb9ba

          SHA1

          5f98a0699b92d2db63e4baa3c71920561bc49838

          SHA256

          306c0a2b8efa7c76f69246bed00e98b1d8c012446abdf48f650d9d7343562c34

          SHA512

          caf704dc43e4976a15a0bccb3ac6a7501d07c6d3855b6b3a1c9a69e1a6e3402548d61119229cdb34526a574cb44b988ac409155e1e308cf87112590aa10228f3

        • C:\Users\Admin\AppData\Local\Temp\iauwp.exe
          Filesize

          80KB

          MD5

          82d9274bf661ed3fdb3d7e7d66efb9ba

          SHA1

          5f98a0699b92d2db63e4baa3c71920561bc49838

          SHA256

          306c0a2b8efa7c76f69246bed00e98b1d8c012446abdf48f650d9d7343562c34

          SHA512

          caf704dc43e4976a15a0bccb3ac6a7501d07c6d3855b6b3a1c9a69e1a6e3402548d61119229cdb34526a574cb44b988ac409155e1e308cf87112590aa10228f3

        • C:\Users\Admin\AppData\Local\Temp\iqvpwdmb.c
          Filesize

          6KB

          MD5

          2dc8af96232838d201200a49b0efa632

          SHA1

          50bc216ff603fdfefbf0ab04ff7ffea362278eb7

          SHA256

          493f4e6b0acc7d4fe146d28857a37873ddaff27dba8b2491b4352db9a0eb9043

          SHA512

          972be1e52ce1f83f414cf3eee27887eb8ccc294f08ca628300236c0147735bdec3e75ed50c313eba20536e51e3485d303a0495ee8caae8dc548ecbc438ff818c

        • C:\Users\Admin\AppData\Local\Temp\robdkcso.dju
          Filesize

          104KB

          MD5

          c4a8e79b487d9f5076ba9235f17e7547

          SHA1

          1bf348776f2b90901abfaa9175a6effb4cd5954c

          SHA256

          b0fa484010127572ef9d688662423a027031012298d8da401597243fdcf54bd9

          SHA512

          d6543cae79e376e690225b3f0b1d3549c84d6c3eec2a8110186cc1e475640b0dd10b87421f8f40680f88210b4dd3d30a6b12c3398946c9245ab83e0848212d78

        • C:\Users\Admin\AppData\Local\icsys.icn.exe
          Filesize

          274KB

          MD5

          7bca1694aa035681f0ebd2b4f1ff1835

          SHA1

          c88a597f9beb5ce96708fa79ff1fd7d4a73b1582

          SHA256

          ee6f10c71ff99a3d2fea29a9992a8e30b8dd05acf7923d5072ecff6cad23d225

          SHA512

          aa934486b3b68041ffc09f87b65c548bda122966b58ae0f9d68bbbdbbb2d17c543e51a9545ad09eff30b65459e99446bb066d2ea556de27cc25206ea1b07d185

        • C:\Users\Admin\AppData\Local\icsys.icn.exe
          Filesize

          274KB

          MD5

          7bca1694aa035681f0ebd2b4f1ff1835

          SHA1

          c88a597f9beb5ce96708fa79ff1fd7d4a73b1582

          SHA256

          ee6f10c71ff99a3d2fea29a9992a8e30b8dd05acf7923d5072ecff6cad23d225

          SHA512

          aa934486b3b68041ffc09f87b65c548bda122966b58ae0f9d68bbbdbbb2d17c543e51a9545ad09eff30b65459e99446bb066d2ea556de27cc25206ea1b07d185

        • C:\Users\Admin\AppData\Roaming\mrsys.exe
          Filesize

          274KB

          MD5

          5deffbc14416c651d53ec36f959e1706

          SHA1

          f48ea006138841c19ad8b19afcdd139ee6b9c981

          SHA256

          64902c75cbb58e7a30e453f90187754c353486065ce9a3aba27fd68cd7516862

          SHA512

          b6f0b419e35a3eb08083587c6dc37f54b81fed42c8169dc0e99f16869466422fb8f8bf17cb4a56bece77b682a6ba635921c7f643a96638e141eb1f3d9748b7b2

        • C:\Windows\System\explorer.exe
          Filesize

          274KB

          MD5

          32b077d470ca68db6609487ab69e74b7

          SHA1

          378346c890d7c397aa785be58a46b62c4ab3bf55

          SHA256

          00b32a8880901c66f1566c664e48f1f237643052dd21e825106b7d322210474f

          SHA512

          9dce08ad2ebc41f051c5ad2c4a5ab4a1feb6478aced06c52de7570519b522476f4f566e37b7b2ff65efbd16a9fe731525cb97713a1f44c8074af690e11074e15

        • C:\Windows\System\spoolsv.exe
          Filesize

          274KB

          MD5

          fcd249ffba6ca35e3cbb690fcedbbb02

          SHA1

          57067401ddc277a94a802b7b5587c1501673ecf9

          SHA256

          86a0e291f0aba9418fffe53bbd2596a289dea76553314fa314e708b44ad9c44c

          SHA512

          760ea7bf9f79e400c6c8632bd142124fafdb4653f7a588b0030d7e6edac531c289737e08ad241149222035206a0b22c30068effc8a5a14bbab5420f105796207

        • C:\Windows\System\spoolsv.exe
          Filesize

          274KB

          MD5

          fcd249ffba6ca35e3cbb690fcedbbb02

          SHA1

          57067401ddc277a94a802b7b5587c1501673ecf9

          SHA256

          86a0e291f0aba9418fffe53bbd2596a289dea76553314fa314e708b44ad9c44c

          SHA512

          760ea7bf9f79e400c6c8632bd142124fafdb4653f7a588b0030d7e6edac531c289737e08ad241149222035206a0b22c30068effc8a5a14bbab5420f105796207

        • C:\Windows\System\svchost.exe
          Filesize

          274KB

          MD5

          7e65b3367bcd96a9f576bc20fffb65bd

          SHA1

          a987e5c3dc692058756a283489b10d493d56d661

          SHA256

          5a5b994551d1bec7dff64459d11b3620cce52f4740b49e9e188b4a5e5ed74863

          SHA512

          c0134ba767a066b87d12ca4acd75c74ccff5567dea1b206dc164255cedadb077cb64d44cbaa172f9deffa413b913742aa85bfb2af517229bfed2657ba2961fe0

        • \??\c:\users\admin\appdata\local\temp\halkbank_ekstre_20230129_075423_612150o.pdf..exe 
          Filesize

          187KB

          MD5

          c742b622a88a10779fe1673d751dc622

          SHA1

          2e1de5d8dbe6ade1af87ce06c31172d8c0a9baa8

          SHA256

          480fb8507176e7ab166f14cdc41e7d2d887555a8327800e989a5b07ec4ac7a2b

          SHA512

          c639ad738805b21617169a34da91fbba7a2b3a296e87cde799c2bda0f169742e8842160dd2bb89da37cdecdd2b17713165e33383e9f92179f5df2624c9bb4e96

        • \??\c:\windows\system\explorer.exe
          Filesize

          274KB

          MD5

          32b077d470ca68db6609487ab69e74b7

          SHA1

          378346c890d7c397aa785be58a46b62c4ab3bf55

          SHA256

          00b32a8880901c66f1566c664e48f1f237643052dd21e825106b7d322210474f

          SHA512

          9dce08ad2ebc41f051c5ad2c4a5ab4a1feb6478aced06c52de7570519b522476f4f566e37b7b2ff65efbd16a9fe731525cb97713a1f44c8074af690e11074e15

        • \??\c:\windows\system\spoolsv.exe
          Filesize

          274KB

          MD5

          fcd249ffba6ca35e3cbb690fcedbbb02

          SHA1

          57067401ddc277a94a802b7b5587c1501673ecf9

          SHA256

          86a0e291f0aba9418fffe53bbd2596a289dea76553314fa314e708b44ad9c44c

          SHA512

          760ea7bf9f79e400c6c8632bd142124fafdb4653f7a588b0030d7e6edac531c289737e08ad241149222035206a0b22c30068effc8a5a14bbab5420f105796207

        • \??\c:\windows\system\svchost.exe
          Filesize

          274KB

          MD5

          7e65b3367bcd96a9f576bc20fffb65bd

          SHA1

          a987e5c3dc692058756a283489b10d493d56d661

          SHA256

          5a5b994551d1bec7dff64459d11b3620cce52f4740b49e9e188b4a5e5ed74863

          SHA512

          c0134ba767a066b87d12ca4acd75c74ccff5567dea1b206dc164255cedadb077cb64d44cbaa172f9deffa413b913742aa85bfb2af517229bfed2657ba2961fe0

        • memory/904-182-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/904-132-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/1128-185-0x0000000005F40000-0x00000000064E4000-memory.dmp
          Filesize

          5.6MB

        • memory/1128-181-0x0000000000400000-0x000000000043A000-memory.dmp
          Filesize

          232KB

        • memory/1128-186-0x0000000005990000-0x0000000005A2C000-memory.dmp
          Filesize

          624KB

        • memory/1128-187-0x0000000006BC0000-0x0000000006D82000-memory.dmp
          Filesize

          1.8MB

        • memory/1128-188-0x0000000006A90000-0x0000000006B22000-memory.dmp
          Filesize

          584KB

        • memory/1128-168-0x0000000000000000-mapping.dmp
        • memory/1128-189-0x0000000006A40000-0x0000000006A4A000-memory.dmp
          Filesize

          40KB

        • memory/1800-172-0x0000000000000000-mapping.dmp
        • memory/1800-177-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/1880-192-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/1880-163-0x0000000000000000-mapping.dmp
        • memory/1880-180-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/2128-183-0x0000000000000000-mapping.dmp
        • memory/2472-190-0x0000000000000000-mapping.dmp
        • memory/2808-193-0x0000000000000000-mapping.dmp
        • memory/3608-136-0x0000000000000000-mapping.dmp
        • memory/4912-156-0x0000000000000000-mapping.dmp
        • memory/4912-178-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/4996-142-0x0000000000000000-mapping.dmp
        • memory/4996-154-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/4996-179-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/5044-148-0x0000000000000000-mapping.dmp
        • memory/5044-191-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/5044-155-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/5068-139-0x0000000000000000-mapping.dmp