Analysis
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max time kernel
149s -
max time network
151s -
platform
windows10-2004_x64 -
resource
win10v2004-20240508-en -
resource tags
arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system -
submitted
31-05-2024 15:44
Behavioral task
behavioral1
Sample
nursultan nexgen fix.exe
Resource
win7-20240508-en
General
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Target
nursultan nexgen fix.exe
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Size
1.5MB
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MD5
a3d07c747770c9a471a44446e46e33d5
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SHA1
8340534fb1770bae9660287ddb0496e243efcfe4
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SHA256
16015088c3352a8257f420555e7ce6245aa0e6682deeca79bf7e08c24e1ac3de
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SHA512
307cbdddaa9f426f8ceec060c2c0b1ab5ed3573e327dbcfdda7b1dfd22cf17559f017d835d71bdd15397fa95b0c7dfbfb4cd6b51cd5b2adc1d1cddc8ffe27f99
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SSDEEP
24576:U2G/nvxW3Ww0tpfnNGcvUCxt9groiK5Cg3ZRvm43TzvmF2cK07:UbA30pfnLRRgrheJROuTzvIR
Malware Config
Signatures
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DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
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Process spawned unexpected child process 9 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
Processes:
schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exedescription pid pid_target process target process Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4752 1628 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1940 1628 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3200 1628 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3188 1628 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 672 1628 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2256 1628 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2400 1628 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2376 1628 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3672 1628 schtasks.exe -
Processes:
resource yara_rule C:\portagentbrowserweb\Containerruntime.exe dcrat behavioral2/memory/4992-13-0x0000000000730000-0x0000000000862000-memory.dmp dcrat -
Disables Task Manager via registry modification
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Checks computer location settings 2 TTPs 3 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
Containerruntime.exenursultan nexgen fix.exeWScript.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation Containerruntime.exe Key value queried \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation nursultan nexgen fix.exe Key value queried \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation WScript.exe -
Executes dropped EXE 2 IoCs
Processes:
Containerruntime.exesihost.exepid process 4992 Containerruntime.exe 2456 sihost.exe -
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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Drops file in Program Files directory 3 IoCs
Processes:
Containerruntime.exedescription ioc process File created C:\Program Files\Windows Media Player\Skins\backgroundTaskHost.exe Containerruntime.exe File opened for modification C:\Program Files\Windows Media Player\Skins\backgroundTaskHost.exe Containerruntime.exe File created C:\Program Files\Windows Media Player\Skins\eddb19405b7ce1 Containerruntime.exe -
Drops file in Windows directory 4 IoCs
Processes:
Containerruntime.exedescription ioc process File created C:\Windows\PLA\Templates\spoolsv.exe Containerruntime.exe File created C:\Windows\PLA\Templates\f3b6ecef712a24 Containerruntime.exe File created C:\Windows\Performance\WinSAT\sihost.exe Containerruntime.exe File created C:\Windows\Performance\WinSAT\66fc9ff0ee96c2 Containerruntime.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Creates scheduled task(s) 1 TTPs 9 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exepid process 3200 schtasks.exe 3188 schtasks.exe 672 schtasks.exe 2376 schtasks.exe 4752 schtasks.exe 1940 schtasks.exe 2256 schtasks.exe 2400 schtasks.exe 3672 schtasks.exe -
Modifies registry class 2 IoCs
Processes:
nursultan nexgen fix.exeContainerruntime.exedescription ioc process Key created \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000_Classes\Local Settings nursultan nexgen fix.exe Key created \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000_Classes\Local Settings Containerruntime.exe -
Modifies registry key 1 TTPs 1 IoCs
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Suspicious behavior: EnumeratesProcesses 18 IoCs
Processes:
Containerruntime.exesihost.exepid process 4992 Containerruntime.exe 4992 Containerruntime.exe 4992 Containerruntime.exe 4992 Containerruntime.exe 4992 Containerruntime.exe 2456 sihost.exe 2456 sihost.exe 2456 sihost.exe 2456 sihost.exe 2456 sihost.exe 2456 sihost.exe 2456 sihost.exe 2456 sihost.exe 2456 sihost.exe 2456 sihost.exe 2456 sihost.exe 2456 sihost.exe 2456 sihost.exe -
Suspicious behavior: GetForegroundWindowSpam 1 IoCs
Processes:
sihost.exepid process 2456 sihost.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Containerruntime.exesihost.exedescription pid process Token: SeDebugPrivilege 4992 Containerruntime.exe Token: SeDebugPrivilege 2456 sihost.exe -
Suspicious use of WriteProcessMemory 17 IoCs
Processes:
nursultan nexgen fix.exeWScript.execmd.exeContainerruntime.execmd.exedescription pid process target process PID 5072 wrote to memory of 1584 5072 nursultan nexgen fix.exe WScript.exe PID 5072 wrote to memory of 1584 5072 nursultan nexgen fix.exe WScript.exe PID 5072 wrote to memory of 1584 5072 nursultan nexgen fix.exe WScript.exe PID 1584 wrote to memory of 408 1584 WScript.exe cmd.exe PID 1584 wrote to memory of 408 1584 WScript.exe cmd.exe PID 1584 wrote to memory of 408 1584 WScript.exe cmd.exe PID 408 wrote to memory of 4992 408 cmd.exe Containerruntime.exe PID 408 wrote to memory of 4992 408 cmd.exe Containerruntime.exe PID 4992 wrote to memory of 2664 4992 Containerruntime.exe cmd.exe PID 4992 wrote to memory of 2664 4992 Containerruntime.exe cmd.exe PID 408 wrote to memory of 4424 408 cmd.exe reg.exe PID 408 wrote to memory of 4424 408 cmd.exe reg.exe PID 408 wrote to memory of 4424 408 cmd.exe reg.exe PID 2664 wrote to memory of 608 2664 cmd.exe w32tm.exe PID 2664 wrote to memory of 608 2664 cmd.exe w32tm.exe PID 2664 wrote to memory of 2456 2664 cmd.exe sihost.exe PID 2664 wrote to memory of 2456 2664 cmd.exe sihost.exe -
Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
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C:\Users\Admin\AppData\Local\Temp\nursultan nexgen fix.exe"C:\Users\Admin\AppData\Local\Temp\nursultan nexgen fix.exe"1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:5072 -
C:\Windows\SysWOW64\WScript.exe"C:\Windows\System32\WScript.exe" "C:\portagentbrowserweb\WRLLAAz5wgYRSh1EMNi6f5aM.vbe"2⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1584 -
C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\portagentbrowserweb\6X9rFgrS3wv5iM7PLkmLFP1j.bat" "3⤵
- Suspicious use of WriteProcessMemory
PID:408 -
C:\portagentbrowserweb\Containerruntime.exe"C:\portagentbrowserweb\Containerruntime.exe"4⤵
- Checks computer location settings
- Executes dropped EXE
- Drops file in Program Files directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4992 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\UstXbKLwhf.bat"5⤵
- Suspicious use of WriteProcessMemory
PID:2664 -
C:\Windows\system32\w32tm.exew32tm /stripchart /computer:localhost /period:5 /dataonly /samples:26⤵PID:608
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C:\Windows\Performance\WinSAT\sihost.exe"C:\Windows\Performance\WinSAT\sihost.exe"6⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
PID:2456 -
C:\Windows\SysWOW64\reg.exereg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f4⤵
- Modifies registry key
PID:4424
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 14 /tr "'C:\Program Files\Windows Media Player\Skins\backgroundTaskHost.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4752
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Program Files\Windows Media Player\Skins\backgroundTaskHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1940
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 8 /tr "'C:\Program Files\Windows Media Player\Skins\backgroundTaskHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3200
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 10 /tr "'C:\Windows\PLA\Templates\spoolsv.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3188
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\PLA\Templates\spoolsv.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:672
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 7 /tr "'C:\Windows\PLA\Templates\spoolsv.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2256
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sihosts" /sc MINUTE /mo 7 /tr "'C:\Windows\Performance\WinSAT\sihost.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2400
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Windows\Performance\WinSAT\sihost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2376
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sihosts" /sc MINUTE /mo 6 /tr "'C:\Windows\Performance\WinSAT\sihost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3672
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\Temp\UstXbKLwhf.batFilesize
205B
MD552d2326db74c265be1a3a99fce1f38e5
SHA16322c49fa6ea721fd47ce2b14c4300db59e37c0d
SHA256c9c12c0c5ecdcc7da708f4453684e117d296e30ceb00d806c9bce5f078f590f9
SHA51260890e4b777247acde03ae1f018c7b1436e00235b9bcb5ad78dab84967cfac952a24e01de4ef9145dde2408ddd981d966d0bc7f5060052921621dcf6c745d49a
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C:\portagentbrowserweb\6X9rFgrS3wv5iM7PLkmLFP1j.batFilesize
157B
MD5c8f8a078dace2ff4cb106803c9199643
SHA1a5029ff4c4f0f24b0fbe2951c9a8002501ebd3b5
SHA2561b99d39fa273f33b072c67e0df7d33b1699fa17b7c7139467a658302a5ed0e0d
SHA512efaea3b4653768bbd135a0ec55319df2464f1d440ad982f31a5eff05c5ba5032f4718683ff6419c668bf1f34a117b5a101f56d1efc1d74ad93e692c52686f999
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C:\portagentbrowserweb\Containerruntime.exeFilesize
1.2MB
MD55887a563351ca99247b7e2c448bd9f2e
SHA1b24695e88143863297535989900bb7521ea86d67
SHA256e74cbd74c838db604926e27322342c02f803b95f98680d4089b5c01ed93fb390
SHA512b7d82bd09ba64891b75bbb9356de74a1ed0835709a391698c1301825777418f57e4f2ae3c260d3f7b6ada05d0e7ddeb4a6b75901fdf53bdd82ffa2febb685107
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C:\portagentbrowserweb\WRLLAAz5wgYRSh1EMNi6f5aM.vbeFilesize
220B
MD561a07f2f9e8e9b1f5175b2d60c3e3f18
SHA1e695b0c2b43c786453bf3f6ae504f0626951d281
SHA2565c75708ec9e4fe419a2fd1067bd5793bacb28140177cc6b36300fbf28e7c23d1
SHA5128ef3529f6bf504224e7803019f1e162aead7961bc1a5115f50fb5f580570e8b04707da21a7aab4eb7f1554a3b5333597fb3335e5f6a74dabfdb0583eecb35b5d
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memory/4992-12-0x00007FFE2F123000-0x00007FFE2F125000-memory.dmpFilesize
8KB
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memory/4992-13-0x0000000000730000-0x0000000000862000-memory.dmpFilesize
1.2MB
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memory/4992-14-0x000000001B990000-0x000000001B9AC000-memory.dmpFilesize
112KB
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memory/4992-15-0x000000001BB20000-0x000000001BB70000-memory.dmpFilesize
320KB
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memory/4992-16-0x000000001B9B0000-0x000000001B9C6000-memory.dmpFilesize
88KB
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memory/4992-17-0x000000001B360000-0x000000001B36C000-memory.dmpFilesize
48KB