tofsee | 514e2b4d0bdd3e933197edebb76699bf006f4b4f410e7adc491d73738c71151f

General

Target

file.exe
Size

276KB
MD5

04c62424433988aed6944dc558855824
SHA1

cb6c87d5dc521549084a92e26330340f56086f24
SHA256

514e2b4d0bdd3e933197edebb76699bf006f4b4f410e7adc491d73738c71151f
SHA512

c69cbbaa911f951b984927a9d772f043b47f157e512ffdc19d585de49af99a8a5b56944e1b34ad92906c297176909c86c9baf8a34057fe11669dcb2c344cebff
SSDEEP

3072:qJq486qfLrfPDC1tq5q6rxBWRmk821kjOzSGyCAIMuJcbP2BcWtV0ofAfpBtShIJ:R1fLbDC1nUFBOz7cgvVSpKuRjMgU

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
Executes dropped EXE 1 IoCs

Processes:

jzbofxi.exe

pid process

212 jzbofxi.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

3116 netsh.exe

pid	process
212	jzbofxi.exe

pid	process
3116	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\uuxrmqwn\ImagePath = "C:\\Windows\\SysWOW64\\uuxrmqwn\\jzbofxi.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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation file.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

jzbofxi.exe

description pid process target process

PID 212 set thread context of 1192 212 jzbofxi.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

3060 sc.exe
4076 sc.exe
2208 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

3712 4912 WerFault.exe file.exe
2908 212 WerFault.exe jzbofxi.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	file.exe

description	pid	process	target process
PID 212 set thread context of 1192	212	jzbofxi.exe	svchost.exe

pid	process
3060	sc.exe
4076	sc.exe
2208	sc.exe

pid	pid_target	process	target process
3712	4912	WerFault.exe	file.exe
2908	212	WerFault.exe	jzbofxi.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exejzbofxi.exe

description	pid	process	target process
PID 4912 wrote to memory of 1984	4912	file.exe	cmd.exe
PID 4912 wrote to memory of 1984	4912	file.exe	cmd.exe
PID 4912 wrote to memory of 1984	4912	file.exe	cmd.exe
PID 4912 wrote to memory of 2328	4912	file.exe	cmd.exe
PID 4912 wrote to memory of 2328	4912	file.exe	cmd.exe
PID 4912 wrote to memory of 2328	4912	file.exe	cmd.exe
PID 4912 wrote to memory of 3060	4912	file.exe	sc.exe
PID 4912 wrote to memory of 3060	4912	file.exe	sc.exe
PID 4912 wrote to memory of 3060	4912	file.exe	sc.exe
PID 4912 wrote to memory of 4076	4912	file.exe	sc.exe
PID 4912 wrote to memory of 4076	4912	file.exe	sc.exe
PID 4912 wrote to memory of 4076	4912	file.exe	sc.exe
PID 4912 wrote to memory of 2208	4912	file.exe	sc.exe
PID 4912 wrote to memory of 2208	4912	file.exe	sc.exe
PID 4912 wrote to memory of 2208	4912	file.exe	sc.exe
PID 4912 wrote to memory of 3116	4912	file.exe	netsh.exe
PID 4912 wrote to memory of 3116	4912	file.exe	netsh.exe
PID 4912 wrote to memory of 3116	4912	file.exe	netsh.exe
PID 212 wrote to memory of 1192	212	jzbofxi.exe	svchost.exe
PID 212 wrote to memory of 1192	212	jzbofxi.exe	svchost.exe
PID 212 wrote to memory of 1192	212	jzbofxi.exe	svchost.exe
PID 212 wrote to memory of 1192	212	jzbofxi.exe	svchost.exe
PID 212 wrote to memory of 1192	212	jzbofxi.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:4912

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uuxrmqwn\
2⤵
PID:1984

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jzbofxi.exe" C:\Windows\SysWOW64\uuxrmqwn\
2⤵
PID:2328

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create uuxrmqwn binPath= "C:\Windows\SysWOW64\uuxrmqwn\jzbofxi.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:3060

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description uuxrmqwn "wifi internet conection"
2⤵
- Launches sc.exe
PID:4076

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start uuxrmqwn
2⤵
- Launches sc.exe
PID:2208

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:3116

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4912 -s 1036
2⤵
- Program crash
PID:3712

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4912 -ip 4912
1⤵
PID:4224

C:\Windows\SysWOW64\uuxrmqwn\jzbofxi.exe
C:\Windows\SysWOW64\uuxrmqwn\jzbofxi.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:212

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:1192

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 212 -s 452
2⤵
- Program crash
PID:2908

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 212 -ip 212
1⤵
PID:2200

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\jzbofxi.exe
Filesize
10.7MB

MD5
497706db276bcca569a98cc6003fe9d8

SHA1
fb87c9c658b8db061172c2a7395c216e20b39e5b

SHA256
b8f140741d59ffbc90d7d475d1dc8de0fb5c80bd59dbdec21e4dd9666c874db2

SHA512
9f7b9006ca939dbd315d2ef46250c61297e5a8e011a0b66de3aaad8eaf6a2c8684e3f4408a81f9a26b2201e8c30e47db289cd1a2864e5468f876abe2e6af3da9

Download Submit
C:\Windows\SysWOW64\uuxrmqwn\jzbofxi.exe
Filesize
10.7MB

MD5
497706db276bcca569a98cc6003fe9d8

SHA1
fb87c9c658b8db061172c2a7395c216e20b39e5b

SHA256
b8f140741d59ffbc90d7d475d1dc8de0fb5c80bd59dbdec21e4dd9666c874db2

SHA512
9f7b9006ca939dbd315d2ef46250c61297e5a8e011a0b66de3aaad8eaf6a2c8684e3f4408a81f9a26b2201e8c30e47db289cd1a2864e5468f876abe2e6af3da9

Download Submit
memory/212-149-0x0000000000400000-0x000000000044A000-memory.dmp

Filesize
296KB

Download
memory/212-148-0x0000000000641000-0x0000000000657000-memory.dmp

Filesize
88KB

Download
memory/1192-151-0x0000000000310000-0x0000000000325000-memory.dmp

Filesize
84KB

Download
memory/1192-150-0x0000000000310000-0x0000000000325000-memory.dmp

Filesize
84KB

Download
memory/1192-144-0x0000000000000000-mapping.dmp

Download
memory/1192-145-0x0000000000310000-0x0000000000325000-memory.dmp

Filesize
84KB

Download
memory/1984-135-0x0000000000000000-mapping.dmp

Download
memory/2208-140-0x0000000000000000-mapping.dmp

Download
memory/2328-136-0x0000000000000000-mapping.dmp

Download
memory/3060-138-0x0000000000000000-mapping.dmp

Download
memory/3116-141-0x0000000000000000-mapping.dmp

Download
memory/4076-139-0x0000000000000000-mapping.dmp

Download
memory/4912-143-0x0000000000400000-0x000000000044A000-memory.dmp

Filesize
296KB

Download
memory/4912-132-0x0000000000647000-0x000000000065D000-memory.dmp

Filesize
88KB

Download
memory/4912-134-0x0000000000400000-0x000000000044A000-memory.dmp

Filesize
296KB

Download
memory/4912-133-0x0000000000490000-0x00000000004A3000-memory.dmp

Filesize
76KB

Download

Analysis

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