tofsee | 5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0

System Information Discovery

Processes:

5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\Control Panel\International\Geo\Nation	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe

Drops file in System32 directory 2 IoCs

Processes:

svchost.exe

description	ioc	process
File created	C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallService\{671BF89A-1493-4E6A-90B3-C8AA19F37638}.catalogItem	svchost.exe
File created	C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallService\{EDD766F3-198D-4D49-A50B-B8FEBCE0DBAB}.catalogItem	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

rrqwhvcf.exe

description pid process target process

PID 2000 set thread context of 3156 2000 rrqwhvcf.exe svchost.exe
Launches sc.exe 3 IoCs
Sc.exe is a Windows utlilty to control services on the system.

Processes:

sc.exesc.exesc.exe

pid process

4260 sc.exe
1268 sc.exe
1848 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

description	pid	process	target process
PID 2000 set thread context of 3156	2000	rrqwhvcf.exe	svchost.exe

pid	process
4260	sc.exe
1268	sc.exe
1848	sc.exe

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

Processes:

svchost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	svchost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	svchost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	svchost.exe

Enumerates system info in registry 2 TTPs 2 IoCs

Query Registry

System Information Discovery

Processes:

svchost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	svchost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exerrqwhvcf.exe

description	pid	process	target process
PID 3108 wrote to memory of 1124	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	cmd.exe
PID 3108 wrote to memory of 1124	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	cmd.exe
PID 3108 wrote to memory of 1124	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	cmd.exe
PID 3108 wrote to memory of 548	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	cmd.exe
PID 3108 wrote to memory of 548	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	cmd.exe
PID 3108 wrote to memory of 548	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	cmd.exe
PID 3108 wrote to memory of 1848	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	sc.exe
PID 3108 wrote to memory of 1848	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	sc.exe
PID 3108 wrote to memory of 1848	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	sc.exe
PID 3108 wrote to memory of 4260	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	sc.exe
PID 3108 wrote to memory of 4260	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	sc.exe
PID 3108 wrote to memory of 4260	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	sc.exe
PID 3108 wrote to memory of 1268	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	sc.exe
PID 3108 wrote to memory of 1268	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	sc.exe
PID 3108 wrote to memory of 1268	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	sc.exe
PID 3108 wrote to memory of 2324	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	netsh.exe
PID 3108 wrote to memory of 2324	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	netsh.exe
PID 3108 wrote to memory of 2324	3108	5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe	netsh.exe
PID 2000 wrote to memory of 3156	2000	rrqwhvcf.exe	svchost.exe
PID 2000 wrote to memory of 3156	2000	rrqwhvcf.exe	svchost.exe
PID 2000 wrote to memory of 3156	2000	rrqwhvcf.exe	svchost.exe
PID 2000 wrote to memory of 3156	2000	rrqwhvcf.exe	svchost.exe
PID 2000 wrote to memory of 3156	2000	rrqwhvcf.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe
"C:\Users\Admin\AppData\Local\Temp\5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3108

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hdtdgvyu\
2⤵
PID:1124

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rrqwhvcf.exe" C:\Windows\SysWOW64\hdtdgvyu\
2⤵
PID:548

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create hdtdgvyu binPath= "C:\Windows\SysWOW64\hdtdgvyu\rrqwhvcf.exe /d\"C:\Users\Admin\AppData\Local\Temp\5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1848

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description hdtdgvyu "wifi internet conection"
2⤵
- Launches sc.exe
PID:4260

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start hdtdgvyu
2⤵
- Launches sc.exe
PID:1268

C:\Windows\SysWOW64\netsh.exe
"C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
2⤵
- Modifies Windows Firewall
PID:2324

C:\Windows\SysWOW64\hdtdgvyu\rrqwhvcf.exe
C:\Windows\SysWOW64\hdtdgvyu\rrqwhvcf.exe /d"C:\Users\Admin\AppData\Local\Temp\5ff46bca8d033a58673c281fa26b7158c1d11ba6eca99a1553e2651fbb0256f0.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2000

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:3156

C:\Windows\System32\svchost.exe
C:\Windows\System32\svchost.exe -k netsvcs -p
1⤵
- Drops file in System32 directory
- Checks processor information in registry
- Enumerates system info in registry
PID:2156

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

New Service

T1050

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

New Service

T1050

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

3

System Information Discovery

4