Analysis
- max time kernel
150s - max time network
148s - platform
windows10-2004_x64 - resource
win10v2004-20240426-en - resource tags
arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system - submitted
22/05/2024, 14:27
Behavioral task
behavioral1
Sample
Build.exe
Resource
win7-20240215-en
16 signatures
150 seconds
Behavioral task
behavioral2
Sample
Build.exe
Resource
win10v2004-20240426-en
16 signatures
150 seconds
General
- Target Build.exe
- Size 1.1MB
- Sample240522-rsfcpaed3y
- SHA256 1c33d65d9936c4c4db8a996c65d24d547ccec4a05f6f144673818946aa49e9d2
- MD5 3275157aa34e7f0a90e48964ab64adb3
- SHA1 0630be35b9ba59ba46dcb74dc758d20fc29794bb
- SHA512 13eb29a2a1bbbd2792d160a1e670cf497a857171f571f5717cdcd521ddd84593df6a6eed930da3046a473acc09352848acccec6e656e10c2b6fad7e4e7bd912a
- SSDEEP 24576:/2G/nvxW3WLElpjtzpmHTohB61xzMQbiD4:/bA3JBoTohYB
- MD5 SHA1 SHA512 SSDEEP
Score
10/10
Malware Config
Signatures
- DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
- Process spawned unexpected child process 30 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
description pid pid_target Process procid_target Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1540 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1676 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 688 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 780 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4080 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4932 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2964 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3964 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3752 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3496 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1708 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2612 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 224 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4412 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3852 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4508 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1492 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1140 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1420 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4068 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2912 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2068 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1916 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4384 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4476 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 684 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2388 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4212 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1216 3696 schtasks.exe 96 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1236 3696 schtasks.exe 96 -
resource yara_rule behavioral2/files/0x000700000002341f-10.dat dcrat behavioral2/memory/3628-13-0x0000000000A10000-0x0000000000AE6000-memory.dmp dcrat - Checks computer location settings 2 TTPs 3 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Control Panel\International\Geo\Nation surrogateServer.exe Key value queried \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Control Panel\International\Geo\Nation Build.exe Key value queried \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Control Panel\International\Geo\Nation WScript.exe - Executes dropped EXE 2 IoCs
pid Process 3628 surrogateServer.exe 3196 backgroundTaskHost.exe - Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
flow ioc 32 pastebin.com 31 pastebin.com - Drops file in Program Files directory 2 IoCs
description ioc Process File created C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\de\cmd.exe surrogateServer.exe File created C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\de\ebf1f9fa8afd6d surrogateServer.exe - Drops file in Windows directory 2 IoCs
description ioc Process File created C:\Windows\TAPI\lsass.exe surrogateServer.exe File created C:\Windows\TAPI\6203df4a6bafc7 surrogateServer.exe - Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Creates scheduled task(s) 1 TTPs 30 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 1676 schtasks.exe 4932 schtasks.exe 3852 schtasks.exe 4508 schtasks.exe 1140 schtasks.exe 4080 schtasks.exe 1492 schtasks.exe 4384 schtasks.exe 684 schtasks.exe 1216 schtasks.exe 1540 schtasks.exe 1420 schtasks.exe 2388 schtasks.exe 2964 schtasks.exe 3964 schtasks.exe 780 schtasks.exe 3496 schtasks.exe 1708 schtasks.exe 4068 schtasks.exe 4212 schtasks.exe 1236 schtasks.exe 3752 schtasks.exe 2612 schtasks.exe 1916 schtasks.exe 4476 schtasks.exe 688 schtasks.exe 2912 schtasks.exe 224 schtasks.exe 4412 schtasks.exe 2068 schtasks.exe - Modifies registry class 2 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000_Classes\Local Settings Build.exe Key created \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000_Classes\Local Settings surrogateServer.exe - Suspicious behavior: EnumeratesProcesses 14 IoCs
pid Process 3628 surrogateServer.exe 3628 surrogateServer.exe 3628 surrogateServer.exe 3628 surrogateServer.exe 3628 surrogateServer.exe 3196 backgroundTaskHost.exe 3196 backgroundTaskHost.exe 3196 backgroundTaskHost.exe 3196 backgroundTaskHost.exe 3196 backgroundTaskHost.exe 3196 backgroundTaskHost.exe 3196 backgroundTaskHost.exe 3196 backgroundTaskHost.exe 3196 backgroundTaskHost.exe - Suspicious behavior: GetForegroundWindowSpam 1 IoCs
pid Process 3196 backgroundTaskHost.exe - Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 3628 surrogateServer.exe Token: SeDebugPrivilege 3196 backgroundTaskHost.exe - Suspicious use of WriteProcessMemory 14 IoCs
description pid Process procid_target PID 3780 wrote to memory of 4880 3780 Build.exe 83 PID 3780 wrote to memory of 4880 3780 Build.exe 83 PID 3780 wrote to memory of 4880 3780 Build.exe 83 PID 4880 wrote to memory of 5024 4880 WScript.exe 91 PID 4880 wrote to memory of 5024 4880 WScript.exe 91 PID 4880 wrote to memory of 5024 4880 WScript.exe 91 PID 5024 wrote to memory of 3628 5024 cmd.exe 93 PID 5024 wrote to memory of 3628 5024 cmd.exe 93 PID 3628 wrote to memory of 3028 3628 surrogateServer.exe 127 PID 3628 wrote to memory of 3028 3628 surrogateServer.exe 127 PID 3028 wrote to memory of 1096 3028 cmd.exe 129 PID 3028 wrote to memory of 1096 3028 cmd.exe 129 PID 3028 wrote to memory of 3196 3028 cmd.exe 131 PID 3028 wrote to memory of 3196 3028 cmd.exe 131 - 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\Build.exe"C:\Users\Admin\AppData\Local\Temp\Build.exe"1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3780 -
C:\Windows\SysWOW64\WScript.exe"C:\Windows\System32\WScript.exe" "C:\mssurrogate\MCh88oSE20.vbe"2⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4880 -
C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\mssurrogate\W0CHjezgOi5W2.bat" "3⤵
- Suspicious use of WriteProcessMemory
PID:5024 -
C:\mssurrogate\surrogateServer.exe"C:\mssurrogate\surrogateServer.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:3628 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\78qztKSG7x.bat"5⤵
- Suspicious use of WriteProcessMemory
PID:3028 -
C:\Windows\system32\w32tm.exew32tm /stripchart /computer:localhost /period:5 /dataonly /samples:26⤵PID:1096
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C:\Recovery\WindowsRE\backgroundTaskHost.exe"C:\Recovery\WindowsRE\backgroundTaskHost.exe"6⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
PID:3196
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrssc" /sc MINUTE /mo 8 /tr "'C:\Recovery\WindowsRE\csrss.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1540
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\csrss.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1676
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrssc" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\csrss.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:688
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\csrss.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:780
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\csrss.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4080
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrssc" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\csrss.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4932
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\TextInputHost.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2964
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\TextInputHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3964
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\TextInputHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3752
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 10 /tr "'C:\Users\Default\Start Menu\backgroundTaskHost.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3496
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Users\Default\Start Menu\backgroundTaskHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1708
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 11 /tr "'C:\Users\Default\Start Menu\backgroundTaskHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2612
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrssc" /sc MINUTE /mo 8 /tr "'C:\Recovery\WindowsRE\csrss.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:224
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\csrss.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4412
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrssc" /sc MINUTE /mo 13 /tr "'C:\Recovery\WindowsRE\csrss.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3852
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\csrss.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4508
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\csrss.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1492
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\csrss.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1140
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "lsassl" /sc MINUTE /mo 7 /tr "'C:\Windows\TAPI\lsass.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1420
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\TAPI\lsass.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4068
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "lsassl" /sc MINUTE /mo 13 /tr "'C:\Windows\TAPI\lsass.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2912
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\backgroundTaskHost.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2068
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\backgroundTaskHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1916
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\backgroundTaskHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4384
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 11 /tr "'C:\Users\Public\Downloads\backgroundTaskHost.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4476
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Users\Public\Downloads\backgroundTaskHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:684
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 8 /tr "'C:\Users\Public\Downloads\backgroundTaskHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2388
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "cmdc" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\de\cmd.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4212
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\de\cmd.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1216
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "cmdc" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\de\cmd.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1236
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
- Path C:\Users\Admin\AppData\Local\Temp\78qztKSG7x.bat
- Size 209B
- SHA256 d4aa3412984ca901dfdec175ac240146d012003f436c9b106a1df17039599eea
- MD5 80e475558d0e9f8e59838bf928bc7a06
- SHA1 b26239c7c0afb460d0e83f9382b03977f7a0884c
- SHA512 d966bfffc288e0dab35ec920fd095ce44f2acbcb99a5864cc8f45bdafb21ed76483d3148b716bffa4c5b054c221722239a22f9d0575dd9e7ac642a0c607adbf1
- MD5 SHA1 SHA512
- Path C:\mssurrogate\MCh88oSE20.vbe
- Size 201B
- SHA256 0854c211911d16745331faf54d5d2807cb6e32c1da42af636741c422d7432065
- MD5 7b0ca17ff694f49e0f6674bceb6066b2
- SHA1 4c562d19d8f4e7c2ff0222ce65dc8c350513065a
- SHA512 e303cfee286ecaf1c487c3c2be9a8f3e0ff4ef195779090fb0ca97bacad47a5a21a8b73463a4d0a5d2b99191a09fbe61122a8b0f7b774ce34bdebe15939024d0
- MD5 SHA1 SHA512
- Path C:\mssurrogate\W0CHjezgOi5W2.bat
- Size 36B
- SHA256 ac3847b4739f5c90c1939eb0b01d47ba8cc6646bcf99f3046bb988c803707790
- MD5 ded4afa1958e275ba270b3cdae075da8
- SHA1 250e5666dab929dccda18f6ef580fa2ebadc3f6b
- SHA512 cf924ebacaf2416ca8644be21d3321bb58dae30d8e46a777263021f3d4d354085af4527a711247c16650a66b716aca2af2241c6036ec1d7f76c2090153dc429b
- MD5 SHA1 SHA512
- Path C:\mssurrogate\surrogateServer.exe
- Size 830KB
- SHA256 5ba64e0a47fb63fb4694c0bc887dd544645adae69dd6bb8e1128bc61ed7d8148
- MD5 e141cf1342281a192e9940f5b8142146
- SHA1 5d01c771e1fdaa36a57c7647877a8f24e8b808fb
- SHA512 6294162c7d513d1c6f99c17fa45e5eb444c3ef349436c74c5db83cd5164b74cf1519a926e831a69a80e1a154a08050396d396e7853e65d854a108ea770387611
- SSDEEP 12288:QtvIFWpji4nBhpmKeTohBDfnuN+0J7zInOpw8QVkWY1BE:spjtzpmHTohB61xzMQbiD
- MD5 SHA1 SHA512 SSDEEP