Analysis
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max time kernel
138s -
max time network
147s -
platform
windows10-2004_x64 -
resource
win10v2004-20231023-en -
resource tags
arch:x64arch:x86image:win10v2004-20231023-enlocale:en-usos:windows10-2004-x64system -
submitted
18/11/2023, 05:49
Behavioral task
behavioral1
Sample
NEAS.8a3f7accb656f787354b8280323176a0.exe
Resource
win7-20231023-en
Behavioral task
behavioral2
Sample
NEAS.8a3f7accb656f787354b8280323176a0.exe
Resource
win10v2004-20231023-en
General
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Target
NEAS.8a3f7accb656f787354b8280323176a0.exe
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Size
783KB
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MD5
8a3f7accb656f787354b8280323176a0
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SHA1
c9544d9107ed710954bf4b575598cc392d567f26
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SHA256
32b2a8994267885e9c2e1b70dfe03a088e45714f90f9aab8c5c89649dba6b80f
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SHA512
c81e198a992c469d5e533cc35a7604fc00097b2c2d4bf0ebed85487f4d9708c8adca543ebf11963d464e007379bc7e62a00bdca84d7dec79b7cefbaa9775bb7e
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SSDEEP
12288:GqnOYxdAgpoNeF91rg5iFdr0yQ9gYx+EIpakCYJRU7Q9bWoFzqK:G+OQbpbgsFdAyQvzSqaq8q
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 6 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 2984 660 schtasks.exe 84 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3116 660 schtasks.exe 84 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3948 660 schtasks.exe 84 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4104 660 schtasks.exe 84 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3928 660 schtasks.exe 84 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4576 660 schtasks.exe 84 -
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" NEAS.8a3f7accb656f787354b8280323176a0.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" NEAS.8a3f7accb656f787354b8280323176a0.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" NEAS.8a3f7accb656f787354b8280323176a0.exe -
resource yara_rule behavioral2/memory/112-0-0x0000000000570000-0x000000000063A000-memory.dmp dcrat behavioral2/files/0x0006000000022d84-34.dat dcrat -
Adds Run key to start application 2 TTPs 6 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\TextInputHost = "\"C:\\PerfLogs\\TextInputHost.exe\"" NEAS.8a3f7accb656f787354b8280323176a0.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\Windows\\System32\\TimeBrokerServer\\dllhost.exe\"" NEAS.8a3f7accb656f787354b8280323176a0.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sysmon = "\"C:\\Windows\\bootstat\\sysmon.exe\"" NEAS.8a3f7accb656f787354b8280323176a0.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\ProgramData\\SoftwareDistribution\\csrss.exe\"" NEAS.8a3f7accb656f787354b8280323176a0.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\backgroundTaskHost = "\"C:\\Windows\\System32\\appidsvc\\backgroundTaskHost.exe\"" NEAS.8a3f7accb656f787354b8280323176a0.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\unsecapp = "\"C:\\Windows\\System32\\wbem\\netttcim_uninstall\\unsecapp.exe\"" NEAS.8a3f7accb656f787354b8280323176a0.exe -
description ioc Process Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA NEAS.8a3f7accb656f787354b8280323176a0.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" NEAS.8a3f7accb656f787354b8280323176a0.exe -
Drops file in System32 directory 7 IoCs
description ioc Process File created C:\Windows\System32\TimeBrokerServer\dllhost.exe NEAS.8a3f7accb656f787354b8280323176a0.exe File created C:\Windows\System32\TimeBrokerServer\5940a34987c99120d96dace90a3f93f329dcad63 NEAS.8a3f7accb656f787354b8280323176a0.exe File created C:\Windows\System32\appidsvc\backgroundTaskHost.exe NEAS.8a3f7accb656f787354b8280323176a0.exe File created C:\Windows\System32\appidsvc\eddb19405b7ce1152b3e19997f2b467f0b72b3d3 NEAS.8a3f7accb656f787354b8280323176a0.exe File created C:\Windows\System32\wbem\netttcim_uninstall\unsecapp.exe NEAS.8a3f7accb656f787354b8280323176a0.exe File created C:\Windows\System32\wbem\netttcim_uninstall\29c1c3cc0f76855c7e7456076a4ffc27e4947119 NEAS.8a3f7accb656f787354b8280323176a0.exe File opened for modification C:\Windows\System32\TimeBrokerServer\RCXFA8E.tmp NEAS.8a3f7accb656f787354b8280323176a0.exe -
Drops file in Windows directory 2 IoCs
description ioc Process File created C:\Windows\bootstat\sysmon.exe NEAS.8a3f7accb656f787354b8280323176a0.exe File created C:\Windows\bootstat\121e5b5079f7c0e46d90f99b3864022518bbbda9 NEAS.8a3f7accb656f787354b8280323176a0.exe -
Creates scheduled task(s) 1 TTPs 6 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 4576 schtasks.exe 2984 schtasks.exe 3116 schtasks.exe 3948 schtasks.exe 4104 schtasks.exe 3928 schtasks.exe -
Suspicious behavior: EnumeratesProcesses 5 IoCs
pid Process 112 NEAS.8a3f7accb656f787354b8280323176a0.exe 112 NEAS.8a3f7accb656f787354b8280323176a0.exe 112 NEAS.8a3f7accb656f787354b8280323176a0.exe 112 NEAS.8a3f7accb656f787354b8280323176a0.exe 112 NEAS.8a3f7accb656f787354b8280323176a0.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 112 NEAS.8a3f7accb656f787354b8280323176a0.exe -
System policy modification 1 TTPs 3 IoCs
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" NEAS.8a3f7accb656f787354b8280323176a0.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" NEAS.8a3f7accb656f787354b8280323176a0.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" NEAS.8a3f7accb656f787354b8280323176a0.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\NEAS.8a3f7accb656f787354b8280323176a0.exe"C:\Users\Admin\AppData\Local\Temp\NEAS.8a3f7accb656f787354b8280323176a0.exe"1⤵
- UAC bypass
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- System policy modification
PID:112
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\PerfLogs\TextInputHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2984
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\TimeBrokerServer\dllhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3116
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Windows\bootstat\sysmon.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3948
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\ProgramData\SoftwareDistribution\csrss.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4104
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Windows\System32\appidsvc\backgroundTaskHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3928
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Windows\System32\wbem\netttcim_uninstall\unsecapp.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4576
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Replay Monitor
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Downloads
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Filesize
783KB
MD58a3f7accb656f787354b8280323176a0
SHA1c9544d9107ed710954bf4b575598cc392d567f26
SHA25632b2a8994267885e9c2e1b70dfe03a088e45714f90f9aab8c5c89649dba6b80f
SHA512c81e198a992c469d5e533cc35a7604fc00097b2c2d4bf0ebed85487f4d9708c8adca543ebf11963d464e007379bc7e62a00bdca84d7dec79b7cefbaa9775bb7e