Analysis
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max time kernel
144s -
max time network
147s -
platform
windows10_x64 -
resource
win10-en-20210920 -
submitted
26-09-2021 20:03
Static task
static1
Behavioral task
behavioral1
Sample
42752f5ad56e5b7db47f5cade7e84abc.exe
Resource
win7v20210408
Behavioral task
behavioral2
Sample
42752f5ad56e5b7db47f5cade7e84abc.exe
Resource
win10-en-20210920
General
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Target
42752f5ad56e5b7db47f5cade7e84abc.exe
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Size
852KB
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MD5
42752f5ad56e5b7db47f5cade7e84abc
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SHA1
e1cb9c502536f14f0760c4404b307a4804cb14c8
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SHA256
926962feeeae5258e6d7bc03c9561cb19912e44b587a1eb30f54f52db479254c
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SHA512
bd41b3d06af5fce351309c6fc05a77aed088be5726a7cfe5b76b2fd05eb962d53c8733adb33ee066fd562d069b4805792aecf280b1f74994f97f7be3db11aa6b
Malware Config
Extracted
agenttesla
Protocol: smtp- Host:
smtp.mail.ru - Port:
587 - Username:
[email protected] - Password:
PxhrKDkvikRcSaP2dkv9
Extracted
oski
schulenburgrvpark.com
Signatures
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AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
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Oski
Oski is an infostealer targeting browser data, crypto wallets.
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suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
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suricata: ET MALWARE Terse alphanumeric executable downloader high likelihood of being hostile
suricata: ET MALWARE Terse alphanumeric executable downloader high likelihood of being hostile
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suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
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AgentTesla Payload 3 IoCs
Processes:
resource yara_rule behavioral2/memory/1948-130-0x0000000000400000-0x000000000043C000-memory.dmp family_agenttesla behavioral2/memory/1948-131-0x00000000004377DE-mapping.dmp family_agenttesla behavioral2/memory/1948-144-0x00000000055B0000-0x0000000005AAE000-memory.dmp family_agenttesla -
Downloads MZ/PE file
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Executes dropped EXE 2 IoCs
Processes:
app.exeapp.exepid process 1468 app.exe 3940 app.exe -
Loads dropped DLL 3 IoCs
Processes:
app.exepid process 3940 app.exe 3940 app.exe 3940 app.exe -
Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
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Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
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Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
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Adds Run key to start application 2 TTPs 1 IoCs
Processes:
42752f5ad56e5b7db47f5cade7e84abc.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000\Software\Microsoft\Windows\CurrentVersion\Run\LKkBk = "C:\\Users\\Admin\\AppData\\Roaming\\LKkBk\\LKkBk.exe" 42752f5ad56e5b7db47f5cade7e84abc.exe -
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
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Suspicious use of SetThreadContext 2 IoCs
Processes:
42752f5ad56e5b7db47f5cade7e84abc.exeapp.exedescription pid process target process PID 2384 set thread context of 1948 2384 42752f5ad56e5b7db47f5cade7e84abc.exe 42752f5ad56e5b7db47f5cade7e84abc.exe PID 1468 set thread context of 3940 1468 app.exe app.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Checks processor information in registry 2 TTPs 1 IoCs
Processor information is often read in order to detect sandboxing environments.
Processes:
app.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString app.exe -
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exepid process 1472 schtasks.exe 1668 schtasks.exe -
Kills process with taskkill 1 IoCs
Processes:
taskkill.exepid process 1196 taskkill.exe -
Modifies registry class 9 IoCs
Processes:
42752f5ad56e5b7db47f5cade7e84abc.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\GMKAssembler.Project\DefaultIcon\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\42752f5ad56e5b7db47f5cade7e84abc.exe" 42752f5ad56e5b7db47f5cade7e84abc.exe Key created \REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\.gmkasm 42752f5ad56e5b7db47f5cade7e84abc.exe Set value (str) \REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\.gmkasm\ = "GMKAssembler.Project" 42752f5ad56e5b7db47f5cade7e84abc.exe Key created \REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\GMKAssembler.Project\Shell 42752f5ad56e5b7db47f5cade7e84abc.exe Set value (str) \REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\GMKAssembler.Project\Shell\open\command\ = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\42752f5ad56e5b7db47f5cade7e84abc.exe\" \"%1\"" 42752f5ad56e5b7db47f5cade7e84abc.exe Key created \REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\GMKAssembler.Project\Shell\open\command 42752f5ad56e5b7db47f5cade7e84abc.exe Key created \REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\GMKAssembler.Project 42752f5ad56e5b7db47f5cade7e84abc.exe Key created \REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\GMKAssembler.Project\Shell\open 42752f5ad56e5b7db47f5cade7e84abc.exe Key created \REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\GMKAssembler.Project\DefaultIcon 42752f5ad56e5b7db47f5cade7e84abc.exe -
Suspicious behavior: EnumeratesProcesses 14 IoCs
Processes:
42752f5ad56e5b7db47f5cade7e84abc.exepowershell.exe42752f5ad56e5b7db47f5cade7e84abc.exeapp.exepowershell.exepid process 2384 42752f5ad56e5b7db47f5cade7e84abc.exe 2384 42752f5ad56e5b7db47f5cade7e84abc.exe 2384 42752f5ad56e5b7db47f5cade7e84abc.exe 2384 42752f5ad56e5b7db47f5cade7e84abc.exe 512 powershell.exe 1948 42752f5ad56e5b7db47f5cade7e84abc.exe 1948 42752f5ad56e5b7db47f5cade7e84abc.exe 512 powershell.exe 512 powershell.exe 1468 app.exe 1468 app.exe 980 powershell.exe 980 powershell.exe 980 powershell.exe -
Suspicious use of AdjustPrivilegeToken 6 IoCs
Processes:
42752f5ad56e5b7db47f5cade7e84abc.exepowershell.exe42752f5ad56e5b7db47f5cade7e84abc.exeapp.exepowershell.exetaskkill.exedescription pid process Token: SeDebugPrivilege 2384 42752f5ad56e5b7db47f5cade7e84abc.exe Token: SeDebugPrivilege 512 powershell.exe Token: SeDebugPrivilege 1948 42752f5ad56e5b7db47f5cade7e84abc.exe Token: SeDebugPrivilege 1468 app.exe Token: SeDebugPrivilege 980 powershell.exe Token: SeDebugPrivilege 1196 taskkill.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
42752f5ad56e5b7db47f5cade7e84abc.exepid process 1948 42752f5ad56e5b7db47f5cade7e84abc.exe -
Suspicious use of WriteProcessMemory 41 IoCs
Processes:
42752f5ad56e5b7db47f5cade7e84abc.exe42752f5ad56e5b7db47f5cade7e84abc.exeapp.exeapp.execmd.exedescription pid process target process PID 2384 wrote to memory of 512 2384 42752f5ad56e5b7db47f5cade7e84abc.exe powershell.exe PID 2384 wrote to memory of 512 2384 42752f5ad56e5b7db47f5cade7e84abc.exe powershell.exe PID 2384 wrote to memory of 512 2384 42752f5ad56e5b7db47f5cade7e84abc.exe powershell.exe PID 2384 wrote to memory of 1472 2384 42752f5ad56e5b7db47f5cade7e84abc.exe schtasks.exe PID 2384 wrote to memory of 1472 2384 42752f5ad56e5b7db47f5cade7e84abc.exe schtasks.exe PID 2384 wrote to memory of 1472 2384 42752f5ad56e5b7db47f5cade7e84abc.exe schtasks.exe PID 2384 wrote to memory of 1088 2384 42752f5ad56e5b7db47f5cade7e84abc.exe 42752f5ad56e5b7db47f5cade7e84abc.exe PID 2384 wrote to memory of 1088 2384 42752f5ad56e5b7db47f5cade7e84abc.exe 42752f5ad56e5b7db47f5cade7e84abc.exe PID 2384 wrote to memory of 1088 2384 42752f5ad56e5b7db47f5cade7e84abc.exe 42752f5ad56e5b7db47f5cade7e84abc.exe PID 2384 wrote to memory of 1948 2384 42752f5ad56e5b7db47f5cade7e84abc.exe 42752f5ad56e5b7db47f5cade7e84abc.exe PID 2384 wrote to memory of 1948 2384 42752f5ad56e5b7db47f5cade7e84abc.exe 42752f5ad56e5b7db47f5cade7e84abc.exe PID 2384 wrote to memory of 1948 2384 42752f5ad56e5b7db47f5cade7e84abc.exe 42752f5ad56e5b7db47f5cade7e84abc.exe PID 2384 wrote to memory of 1948 2384 42752f5ad56e5b7db47f5cade7e84abc.exe 42752f5ad56e5b7db47f5cade7e84abc.exe PID 2384 wrote to memory of 1948 2384 42752f5ad56e5b7db47f5cade7e84abc.exe 42752f5ad56e5b7db47f5cade7e84abc.exe PID 2384 wrote to memory of 1948 2384 42752f5ad56e5b7db47f5cade7e84abc.exe 42752f5ad56e5b7db47f5cade7e84abc.exe PID 2384 wrote to memory of 1948 2384 42752f5ad56e5b7db47f5cade7e84abc.exe 42752f5ad56e5b7db47f5cade7e84abc.exe PID 2384 wrote to memory of 1948 2384 42752f5ad56e5b7db47f5cade7e84abc.exe 42752f5ad56e5b7db47f5cade7e84abc.exe PID 1948 wrote to memory of 1468 1948 42752f5ad56e5b7db47f5cade7e84abc.exe app.exe PID 1948 wrote to memory of 1468 1948 42752f5ad56e5b7db47f5cade7e84abc.exe app.exe PID 1948 wrote to memory of 1468 1948 42752f5ad56e5b7db47f5cade7e84abc.exe app.exe PID 1468 wrote to memory of 980 1468 app.exe powershell.exe PID 1468 wrote to memory of 980 1468 app.exe powershell.exe PID 1468 wrote to memory of 980 1468 app.exe powershell.exe PID 1468 wrote to memory of 1668 1468 app.exe schtasks.exe PID 1468 wrote to memory of 1668 1468 app.exe schtasks.exe PID 1468 wrote to memory of 1668 1468 app.exe schtasks.exe PID 1468 wrote to memory of 3940 1468 app.exe app.exe PID 1468 wrote to memory of 3940 1468 app.exe app.exe PID 1468 wrote to memory of 3940 1468 app.exe app.exe PID 1468 wrote to memory of 3940 1468 app.exe app.exe PID 1468 wrote to memory of 3940 1468 app.exe app.exe PID 1468 wrote to memory of 3940 1468 app.exe app.exe PID 1468 wrote to memory of 3940 1468 app.exe app.exe PID 1468 wrote to memory of 3940 1468 app.exe app.exe PID 1468 wrote to memory of 3940 1468 app.exe app.exe PID 3940 wrote to memory of 2752 3940 app.exe cmd.exe PID 3940 wrote to memory of 2752 3940 app.exe cmd.exe PID 3940 wrote to memory of 2752 3940 app.exe cmd.exe PID 2752 wrote to memory of 1196 2752 cmd.exe taskkill.exe PID 2752 wrote to memory of 1196 2752 cmd.exe taskkill.exe PID 2752 wrote to memory of 1196 2752 cmd.exe taskkill.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe"C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe"1⤵
- Suspicious use of SetThreadContext
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2384 -
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe"2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:512
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C:\Windows\SysWOW64\schtasks.exe"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\tlZLQDWEhCq" /XML "C:\Users\Admin\AppData\Local\Temp\tmp108B.tmp"2⤵
- Creates scheduled task(s)
PID:1472
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C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe"C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe"2⤵PID:1088
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C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe"C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe"2⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1948 -
C:\Users\Admin\AppData\Local\Temp\app.exe"C:\Users\Admin\AppData\Local\Temp\app.exe"3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1468 -
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\app.exe"4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:980
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C:\Windows\SysWOW64\schtasks.exe"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\vhdkcrwsNOIJ" /XML "C:\Users\Admin\AppData\Local\Temp\tmp4C76.tmp"4⤵
- Creates scheduled task(s)
PID:1668
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C:\Users\Admin\AppData\Local\Temp\app.exe"C:\Users\Admin\AppData\Local\Temp\app.exe"4⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:3940 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /pid 3940 & erase C:\Users\Admin\AppData\Local\Temp\app.exe & RD /S /Q C:\\ProgramData\\736194751312495\\* & exit5⤵
- Suspicious use of WriteProcessMemory
PID:2752 -
C:\Windows\SysWOW64\taskkill.exetaskkill /pid 39406⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1196
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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MD5
db01a2c1c7e70b2b038edf8ad5ad9826
SHA1540217c647a73bad8d8a79e3a0f3998b5abd199b
SHA256413da361d77055dae7007f82b58b366c8783aa72e0b8fbe41519b940c253b38d
SHA512c76ff57fcee5cdf9fdf3116d4e1dc0cf106867bf19ab474b763e242acf5dca9a7509cb837c35e130c3e056636b4e8a4e135512a978bcd3dd641e20f5bf76c3d6
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MD5
f826d8accdaa99a82568095d1aa20144
SHA1ded681e0340aa4c80d1bc34d81b7bad84dbea41e
SHA256dfc263ddf7a64e06657290d89ba96aa3e4af667f71278e5d8290240bdb414ab5
SHA512aef0423138b9c90ecaed1aa48972a07fbbf0fcfac794c7b57ce70692d7e4746195cee1dc23d28ac6f75157996d7c194f0b9ff95658787489c0beecfd666bdef4
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MD5
9a1c9056f35e3923800d334987f671e4
SHA1919904d34d8992084e2646b6243872698d7e72d3
SHA256cb282f663b4ad5bbe80246cb866afafea7b90aa3219ba62f1aac5f22c6b6040f
SHA5125e45a87974b6d41d38b247d79bd63bd58ae679836b37d3a3e30234a9cb7f31aadad66e3f90e419b9e4e890314573f2868fd98660f2ed82f05a175febfdb6be09
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MD5
9a1c9056f35e3923800d334987f671e4
SHA1919904d34d8992084e2646b6243872698d7e72d3
SHA256cb282f663b4ad5bbe80246cb866afafea7b90aa3219ba62f1aac5f22c6b6040f
SHA5125e45a87974b6d41d38b247d79bd63bd58ae679836b37d3a3e30234a9cb7f31aadad66e3f90e419b9e4e890314573f2868fd98660f2ed82f05a175febfdb6be09
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MD5
9a1c9056f35e3923800d334987f671e4
SHA1919904d34d8992084e2646b6243872698d7e72d3
SHA256cb282f663b4ad5bbe80246cb866afafea7b90aa3219ba62f1aac5f22c6b6040f
SHA5125e45a87974b6d41d38b247d79bd63bd58ae679836b37d3a3e30234a9cb7f31aadad66e3f90e419b9e4e890314573f2868fd98660f2ed82f05a175febfdb6be09
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MD5
8f73c08a9660691143661bf7332c3c27
SHA137fa65dd737c50fda710fdbde89e51374d0c204a
SHA2563fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd
SHA5120042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89
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MD5
bfac4e3c5908856ba17d41edcd455a51
SHA18eec7e888767aa9e4cca8ff246eb2aacb9170428
SHA256e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78
SHA5122565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66
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MD5
e477a96c8f2b18d6b5c27bde49c990bf
SHA1e980c9bf41330d1e5bd04556db4646a0210f7409
SHA25616574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660
SHA512335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c