tofsee | bb601ef5b3cef445b6f9eea25573ae26c8c40317278d8346fb289f283f3ebc47

General

Target

file.exe
Size

321KB
MD5

6388175964e8a802a8a33fea99990f8e
SHA1

a68f065464df424b726be370c209f47a4fb3755b
SHA256

bb601ef5b3cef445b6f9eea25573ae26c8c40317278d8346fb289f283f3ebc47
SHA512

c874f3900b47b6bd41f2275a360d7b97a0c5cf0e1df355dcfdb67c8d7e9124f646693bda305ce8d3937997b34d07de441ec7f0d16effbcb17c5524051d43c1d8
SSDEEP

6144:frLZLCRK0YQ0q1x8CweTkzZzCCyruQj9ZExaMc:DLZGRKmxVT6hCnrljCa

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Creates new service(s) 1 TTPs
persistence

New Service
T1050
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

4032 netsh.exe

pid	process
4032	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\ushvagxq\ImagePath = "C:\\Windows\\SysWOW64\\ushvagxq\\kqdyrylg.exe"	svchost.exe

Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

file.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation file.exe
Executes dropped EXE 1 IoCs

Processes:

kqdyrylg.exe

pid process

4480 kqdyrylg.exe
Drops file in System32 directory 1 IoCs

Processes:

svchost.exe

description ioc process

File created C:\Windows\SysWOW64\config\systemprofile:.repos svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

kqdyrylg.exe

description pid process target process

PID 4480 set thread context of 1144 4480 kqdyrylg.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

2580 sc.exe
4476 sc.exe
2648 sc.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

1848 1208 WerFault.exe file.exe
2212 4480 WerFault.exe kqdyrylg.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	file.exe

pid	process
4480	kqdyrylg.exe

description	ioc	process
File created	C:\Windows\SysWOW64\config\systemprofile:.repos	svchost.exe

description	pid	process	target process
PID 4480 set thread context of 1144	4480	kqdyrylg.exe	svchost.exe

pid	process
2580	sc.exe
4476	sc.exe
2648	sc.exe

pid	pid_target	process	target process
1848	1208	WerFault.exe	file.exe
2212	4480	WerFault.exe	kqdyrylg.exe

Modifies data under HKEY_USERS 2 IoCs

Processes:

svchost.exe

description	ioc	process
Key created	\REGISTRY\USER\.DEFAULT\Control Panel\Buses	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Buses\Config0 = 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	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exekqdyrylg.exe

description	pid	process	target process
PID 1208 wrote to memory of 3024	1208	file.exe	cmd.exe
PID 1208 wrote to memory of 3024	1208	file.exe	cmd.exe
PID 1208 wrote to memory of 3024	1208	file.exe	cmd.exe
PID 1208 wrote to memory of 2416	1208	file.exe	cmd.exe
PID 1208 wrote to memory of 2416	1208	file.exe	cmd.exe
PID 1208 wrote to memory of 2416	1208	file.exe	cmd.exe
PID 1208 wrote to memory of 2580	1208	file.exe	sc.exe
PID 1208 wrote to memory of 2580	1208	file.exe	sc.exe
PID 1208 wrote to memory of 2580	1208	file.exe	sc.exe
PID 1208 wrote to memory of 4476	1208	file.exe	sc.exe
PID 1208 wrote to memory of 4476	1208	file.exe	sc.exe
PID 1208 wrote to memory of 4476	1208	file.exe	sc.exe
PID 1208 wrote to memory of 2648	1208	file.exe	sc.exe
PID 1208 wrote to memory of 2648	1208	file.exe	sc.exe
PID 1208 wrote to memory of 2648	1208	file.exe	sc.exe
PID 1208 wrote to memory of 4032	1208	file.exe	netsh.exe
PID 1208 wrote to memory of 4032	1208	file.exe	netsh.exe
PID 1208 wrote to memory of 4032	1208	file.exe	netsh.exe
PID 4480 wrote to memory of 1144	4480	kqdyrylg.exe	svchost.exe
PID 4480 wrote to memory of 1144	4480	kqdyrylg.exe	svchost.exe
PID 4480 wrote to memory of 1144	4480	kqdyrylg.exe	svchost.exe
PID 4480 wrote to memory of 1144	4480	kqdyrylg.exe	svchost.exe
PID 4480 wrote to memory of 1144	4480	kqdyrylg.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1208

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ushvagxq\
2⤵
PID:3024

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\kqdyrylg.exe" C:\Windows\SysWOW64\ushvagxq\
2⤵
PID:2416

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create ushvagxq binPath= "C:\Windows\SysWOW64\ushvagxq\kqdyrylg.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:2580

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description ushvagxq "wifi internet conection"
2⤵
- Launches sc.exe
PID:4476

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start ushvagxq
2⤵
- Launches sc.exe
PID:2648

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:4032

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1208 -s 788
2⤵
- Program crash
PID:1848

C:\Windows\SysWOW64\ushvagxq\kqdyrylg.exe
C:\Windows\SysWOW64\ushvagxq\kqdyrylg.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4480

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:1144

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4480 -s 548
2⤵
- Program crash
PID:2212

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 1208 -ip 1208
1⤵
PID:3136

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 4480 -ip 4480
1⤵
PID:5056

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

New Service

1

T1050

Modify Existing Service

1

T1031

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

New Service

1

T1050

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\kqdyrylg.exe
Filesize
13.1MB

MD5
e5ee78c36cbe5fa0bfa12fa45f92b5c4

SHA1
258cca0051f29da5c9abc20f7e79a56fff3372c4

SHA256
4b529d0d664fb0d31147800efa618d60772404925240ec2c8dfe4d5d90183394

SHA512
0a650e5f1d3802d88b07caa25416ed3143d4f93e4c26b2c86ca9241bbc1c2414b834a2c4d220574bda44788d694b5724d8cd88132c959046cb3bfd47e908ccb6

Download Submit
C:\Windows\SysWOW64\ushvagxq\kqdyrylg.exe
Filesize
13.1MB

MD5
e5ee78c36cbe5fa0bfa12fa45f92b5c4

SHA1
258cca0051f29da5c9abc20f7e79a56fff3372c4

SHA256
4b529d0d664fb0d31147800efa618d60772404925240ec2c8dfe4d5d90183394

SHA512
0a650e5f1d3802d88b07caa25416ed3143d4f93e4c26b2c86ca9241bbc1c2414b834a2c4d220574bda44788d694b5724d8cd88132c959046cb3bfd47e908ccb6

Download Submit
memory/1144-152-0x00000000008F0000-0x0000000000905000-memory.dmp

Filesize
84KB

Download
memory/1144-151-0x00000000008F0000-0x0000000000905000-memory.dmp

Filesize
84KB

Download
memory/1144-146-0x00000000008F0000-0x0000000000905000-memory.dmp

Filesize
84KB

Download
memory/1144-145-0x0000000000000000-mapping.dmp

Download
memory/1208-143-0x000000000055E000-0x0000000000574000-memory.dmp

Filesize
88KB

Download
memory/1208-133-0x00000000021A0000-0x00000000021B3000-memory.dmp

Filesize
76KB

Download
memory/1208-134-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download
memory/1208-132-0x000000000055E000-0x0000000000574000-memory.dmp

Filesize
88KB

Download
memory/1208-144-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download
memory/2416-136-0x0000000000000000-mapping.dmp

Download
memory/2580-138-0x0000000000000000-mapping.dmp

Download
memory/2648-140-0x0000000000000000-mapping.dmp

Download
memory/3024-135-0x0000000000000000-mapping.dmp

Download
memory/4032-142-0x0000000000000000-mapping.dmp

Download
memory/4476-139-0x0000000000000000-mapping.dmp

Download
memory/4480-149-0x0000000000629000-0x000000000063F000-memory.dmp

Filesize
88KB

Download
memory/4480-150-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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