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
    151s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01-02-2023 16:57

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:2700
    • \??\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:2840
      • 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:4324
        • 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 behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • outlook_office_path
          • outlook_win_path
          PID:2496
    • 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:1392
      • \??\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:3800
        • \??\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:2748
          • \??\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:4540
            • \??\c:\windows\system\spoolsv.exe
              c:\windows\system\spoolsv.exe PR
              6⤵
              • Executes dropped EXE
              • Suspicious use of SetWindowsHookEx
              PID:208
            • C:\Windows\SysWOW64\at.exe
              at 17:59 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
              6⤵
                PID:2080
              • C:\Windows\SysWOW64\at.exe
                at 18:00 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
                6⤵
                  PID:3948
                • C:\Windows\SysWOW64\at.exe
                  at 18:01 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
                  6⤵
                    PID:4088

        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

          229a8b0f708c5cf19813536d03943346

          SHA1

          9b0513650c7a2e202f1cb8601c3771f77839abd3

          SHA256

          a813df3cd6526b9bd60daaf5380c0794d07d54ea9702a91c5104e06827108f24

          SHA512

          9e7546f36588822aed1c57aa3694b58741739a5b0bfb021bfed37d29e29077604ef36d3279d1927002db5dbf021260e860b43cc898861d0e7d7f74f2527cc944

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

          274KB

          MD5

          b118bc4c3c0e21433a2bc6cb69f4169d

          SHA1

          1f7c995f795de4cfb53bbf700c84519ff7f65967

          SHA256

          9d372c6b68a9cc41e58a0ba773d8beb552330c3ea833c9716cc2e098efdb6a4e

          SHA512

          7a5a0fea610b4bb9a6bc6fe9dff3b3ad0969d72c3bd5ef5945e155c37c079bdf50490b5274f815d539b6d8756be7e72d51fbbe72545a201e8039c8a27cd5f21f

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

          274KB

          MD5

          02e78c2523f04ab9f26f276e4d91685f

          SHA1

          6fcfda0ca071bd4db088283603c5eb28baa9fe49

          SHA256

          92253242836a4aea9c8da6162dfd893ac4fe1a3760b986d7016fcba722c839a8

          SHA512

          36cf5d036982114f3854b912a227db297e9ad6a78e0c31d60af1abdc765461f66e81b1fc2fed8bfa4d1ed3c4f9a9531b3263f667d17c0c9c8ff31b41cc911de0

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

          274KB

          MD5

          02e78c2523f04ab9f26f276e4d91685f

          SHA1

          6fcfda0ca071bd4db088283603c5eb28baa9fe49

          SHA256

          92253242836a4aea9c8da6162dfd893ac4fe1a3760b986d7016fcba722c839a8

          SHA512

          36cf5d036982114f3854b912a227db297e9ad6a78e0c31d60af1abdc765461f66e81b1fc2fed8bfa4d1ed3c4f9a9531b3263f667d17c0c9c8ff31b41cc911de0

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

          274KB

          MD5

          613f0dca369233baa2ea3ca4871964c7

          SHA1

          67f225920c9391167aaf61de9cf72bc3b6dd224f

          SHA256

          547c6e1bb39da2baae0946f1035c190303d8287b856b83bebab65b29a7caf1cb

          SHA512

          69739713ee2b417edfc1c51b76b499bea459a1623e38fc88d2667e1b5b011c3dd349bafa84b9ac32e8ad695d15d62f2e4b4f9ea68b8bcd5780f18e799a1470e8

        • \??\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

          b118bc4c3c0e21433a2bc6cb69f4169d

          SHA1

          1f7c995f795de4cfb53bbf700c84519ff7f65967

          SHA256

          9d372c6b68a9cc41e58a0ba773d8beb552330c3ea833c9716cc2e098efdb6a4e

          SHA512

          7a5a0fea610b4bb9a6bc6fe9dff3b3ad0969d72c3bd5ef5945e155c37c079bdf50490b5274f815d539b6d8756be7e72d51fbbe72545a201e8039c8a27cd5f21f

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

          274KB

          MD5

          02e78c2523f04ab9f26f276e4d91685f

          SHA1

          6fcfda0ca071bd4db088283603c5eb28baa9fe49

          SHA256

          92253242836a4aea9c8da6162dfd893ac4fe1a3760b986d7016fcba722c839a8

          SHA512

          36cf5d036982114f3854b912a227db297e9ad6a78e0c31d60af1abdc765461f66e81b1fc2fed8bfa4d1ed3c4f9a9531b3263f667d17c0c9c8ff31b41cc911de0

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

          274KB

          MD5

          613f0dca369233baa2ea3ca4871964c7

          SHA1

          67f225920c9391167aaf61de9cf72bc3b6dd224f

          SHA256

          547c6e1bb39da2baae0946f1035c190303d8287b856b83bebab65b29a7caf1cb

          SHA512

          69739713ee2b417edfc1c51b76b499bea459a1623e38fc88d2667e1b5b011c3dd349bafa84b9ac32e8ad695d15d62f2e4b4f9ea68b8bcd5780f18e799a1470e8

        • memory/208-173-0x0000000000000000-mapping.dmp
        • memory/208-183-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/208-182-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/1392-147-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/1392-143-0x0000000000000000-mapping.dmp
        • memory/1392-188-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/2080-184-0x0000000000000000-mapping.dmp
        • memory/2496-191-0x0000000006A60000-0x0000000006A6A000-memory.dmp
          Filesize

          40KB

        • memory/2496-190-0x0000000006AB0000-0x0000000006B42000-memory.dmp
          Filesize

          584KB

        • memory/2496-169-0x00000000057A0000-0x000000000583C000-memory.dmp
          Filesize

          624KB

        • memory/2496-154-0x0000000000000000-mapping.dmp
        • memory/2496-189-0x0000000006BE0000-0x0000000006DA2000-memory.dmp
          Filesize

          1.8MB

        • memory/2496-165-0x0000000005E00000-0x00000000063A4000-memory.dmp
          Filesize

          5.6MB

        • memory/2496-177-0x0000000000400000-0x000000000043A000-memory.dmp
          Filesize

          232KB

        • memory/2700-135-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/2700-187-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/2748-159-0x0000000000000000-mapping.dmp
        • memory/2748-179-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/2748-185-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/2840-136-0x0000000000000000-mapping.dmp
        • memory/3800-175-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/3800-150-0x0000000000000000-mapping.dmp
        • memory/3800-193-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/3948-192-0x0000000000000000-mapping.dmp
        • memory/4088-195-0x0000000000000000-mapping.dmp
        • memory/4324-139-0x0000000000000000-mapping.dmp
        • memory/4540-180-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB

        • memory/4540-166-0x0000000000000000-mapping.dmp
        • memory/4540-194-0x0000000000400000-0x000000000043E000-memory.dmp
          Filesize

          248KB