vidar | 3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3

System Information Discovery

Processes:

3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.execonf.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Control Panel\International\Geo\Nation	3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Control Panel\International\Geo\Nation	conf.exe

Reads local data of messenger clients 2 TTPs
Infostealers often target stored data of messaging applications, which can include saved credentials and account information.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Accesses 2FA software files, possible credential harvesting 2 TTPs
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012
Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

7 ip-api.com

flow	ioc
7	ip-api.com

AutoIT Executable 3 IoCs

AutoIT scripts compiled to PE executables.

Processes:

resource	yara_rule
behavioral2/memory/4208-155-0x0000000000400000-0x0000000000521000-memory.dmp	autoit_exe
behavioral2/memory/1500-162-0x0000000000400000-0x0000000000521000-memory.dmp	autoit_exe
behavioral2/memory/1500-167-0x0000000000400000-0x0000000000521000-memory.dmp	autoit_exe

Drops file in Program Files directory 5 IoCs

Processes:

3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe

description	ioc	process
File opened for modification	C:\Program Files (x86)\LetsSee!\YTLoader.exe	3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe
File opened for modification	C:\Program Files (x86)\LetsSee!\busshost.exe	3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe
File opened for modification	C:\Program Files (x86)\LetsSee!\conf.exe	3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe
File opened for modification	C:\Program Files (x86)\LetsSee!\Uninstall.exe	3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe
File created	C:\Program Files (x86)\LetsSee!\Uninstall.ini	3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe

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

System Information Discovery
T1082
Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid pid_target process target process

3872 4932 WerFault.exe YTLoader.exe
4956 4208 WerFault.exe conf.exe

pid	pid_target	process	target process
3872	4932	WerFault.exe	YTLoader.exe
4956	4208	WerFault.exe	conf.exe

Checks processor information in registry 2 TTPs 4 IoCs

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

Query Registry

System Information Discovery

Processes:

YTLoader.exebusshost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	YTLoader.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	YTLoader.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	busshost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	busshost.exe

Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exeschtasks.exe

pid process

4448 schtasks.exe
4720 schtasks.exe

pid	process
4448	schtasks.exe
4720	schtasks.exe

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

System Information Discovery

Processes:

YTLoader.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemProductName	YTLoader.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS	YTLoader.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemManufacturer	YTLoader.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery
T1018

Processes:

PING.EXE

pid process

2304 PING.EXE
Suspicious behavior: EnumeratesProcesses 8 IoCs

Processes:

busshost.exe

pid process

4592 busshost.exe
4592 busshost.exe
4592 busshost.exe
4592 busshost.exe
4592 busshost.exe
4592 busshost.exe
4592 busshost.exe
4592 busshost.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

YTLoader.exe

description pid process

Token: SeDebugPrivilege 4932 YTLoader.exe

pid	process
2304	PING.EXE

pid	process
4592	busshost.exe
4592	busshost.exe
4592	busshost.exe
4592	busshost.exe
4592	busshost.exe
4592	busshost.exe
4592	busshost.exe
4592	busshost.exe

description	pid	process
Token: SeDebugPrivilege	4932	YTLoader.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.execonf.execmd.exeattachmentphoto.execmd.execmd.exe

description	pid	process	target process
PID 3076 wrote to memory of 4592	3076	3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe	busshost.exe
PID 3076 wrote to memory of 4592	3076	3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe	busshost.exe
PID 3076 wrote to memory of 4592	3076	3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe	busshost.exe
PID 3076 wrote to memory of 4932	3076	3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe	YTLoader.exe
PID 3076 wrote to memory of 4932	3076	3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe	YTLoader.exe
PID 3076 wrote to memory of 4932	3076	3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe	YTLoader.exe
PID 3076 wrote to memory of 4208	3076	3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe	conf.exe
PID 3076 wrote to memory of 4208	3076	3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe	conf.exe
PID 3076 wrote to memory of 4208	3076	3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe	conf.exe
PID 4208 wrote to memory of 1500	4208	conf.exe	attachmentphoto.exe
PID 4208 wrote to memory of 1500	4208	conf.exe	attachmentphoto.exe
PID 4208 wrote to memory of 1500	4208	conf.exe	attachmentphoto.exe
PID 4208 wrote to memory of 228	4208	conf.exe	cmd.exe
PID 4208 wrote to memory of 228	4208	conf.exe	cmd.exe
PID 4208 wrote to memory of 228	4208	conf.exe	cmd.exe
PID 228 wrote to memory of 2304	228	cmd.exe	PING.EXE
PID 228 wrote to memory of 2304	228	cmd.exe	PING.EXE
PID 228 wrote to memory of 2304	228	cmd.exe	PING.EXE
PID 1500 wrote to memory of 2188	1500	attachmentphoto.exe	cmd.exe
PID 1500 wrote to memory of 2188	1500	attachmentphoto.exe	cmd.exe
PID 1500 wrote to memory of 2188	1500	attachmentphoto.exe	cmd.exe
PID 1500 wrote to memory of 3632	1500	attachmentphoto.exe	cmd.exe
PID 1500 wrote to memory of 3632	1500	attachmentphoto.exe	cmd.exe
PID 1500 wrote to memory of 3632	1500	attachmentphoto.exe	cmd.exe
PID 2188 wrote to memory of 4720	2188	cmd.exe	schtasks.exe
PID 2188 wrote to memory of 4720	2188	cmd.exe	schtasks.exe
PID 2188 wrote to memory of 4720	2188	cmd.exe	schtasks.exe
PID 3632 wrote to memory of 4448	3632	cmd.exe	schtasks.exe
PID 3632 wrote to memory of 4448	3632	cmd.exe	schtasks.exe
PID 3632 wrote to memory of 4448	3632	cmd.exe	schtasks.exe

C:\Users\Admin\AppData\Local\Temp\3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe
"C:\Users\Admin\AppData\Local\Temp\3b9c5ff5adeae8d2cec922ed51eee0c9af43016c25163865480fba723acebff3.exe"
1⤵
- Checks computer location settings
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
PID:3076

C:\Program Files (x86)\LetsSee!\busshost.exe
"C:\Program Files (x86)\LetsSee!\busshost.exe"
2⤵
- Executes dropped EXE
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
PID:4592

C:\Program Files (x86)\LetsSee!\YTLoader.exe
"C:\Program Files (x86)\LetsSee!\YTLoader.exe"
2⤵
- Executes dropped EXE
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious use of AdjustPrivilegeToken
PID:4932

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4932 -s 1612
3⤵
- Program crash
PID:3872

C:\Program Files (x86)\LetsSee!\conf.exe
"C:\Program Files (x86)\LetsSee!\conf.exe"
2⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4208

C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CTLs\7ZipArchiver\attachmentphoto.exe
C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CTLs\7ZipArchiver\attachmentphoto.exe
3⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:1500

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c SchTasks /create /SC MINUTE /TN 7ZipUnis /TR C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CTLs\7ZipArchiver\volumfix.exe
4⤵
- Suspicious use of WriteProcessMemory
PID:2188

C:\Windows\SysWOW64\schtasks.exe
SchTasks /create /SC MINUTE /TN 7ZipUnis /TR C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CTLs\7ZipArchiver\volumfix.exe
5⤵
- Creates scheduled task(s)
PID:4720

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c SchTasks /create /SC HOURLY /TN FlashServis /TR C:\ProgramData\FlashSys\CurlMSI.exe
4⤵
- Suspicious use of WriteProcessMemory
PID:3632

C:\Windows\SysWOW64\schtasks.exe
SchTasks /create /SC HOURLY /TN FlashServis /TR C:\ProgramData\FlashSys\CurlMSI.exe
5⤵
- Creates scheduled task(s)
PID:4448

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k ping -n 2 localhost < nul & del /F /Q "C:\Program Files (x86)\LetsSee!\conf.exe"
3⤵
- Suspicious use of WriteProcessMemory
PID:228

C:\Windows\SysWOW64\PING.EXE
ping -n 2 localhost
4⤵
- Runs ping.exe
PID:2304

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4208 -s 1128
3⤵
- Program crash
PID:4956

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4932 -ip 4932
1⤵
PID:2764

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 4208 -ip 4208
1⤵
PID:1140

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

System Information Discovery

Remote System Discovery

T1018

Lateral Movement

Collection

Data from Local System