tofsee | 1fb5e05e383ce3b2950d93894f802b730a867f688d6af5d80f404956117d3e89

General

Target

file.exe
Size

276KB
MD5

68d3b1e67263b0d65c81e9738924c21d
SHA1

29ef6a67c445c7ba49c4206bfac2da03a9d8ac1b
SHA256

1fb5e05e383ce3b2950d93894f802b730a867f688d6af5d80f404956117d3e89
SHA512

1acdb17454cf8333b8d92d2263ba58f5fd079dd37a35df3b19ae51b6891fd9b23421fdf4a0347862d37dcf49343e7603486fb7509c6764f7bf5a5235935b7746
SSDEEP

3072:siRc48qyPDiLo4YXMtq5qsDm6JPWXylDBKJ+0h5h0jKPcWJME9hIh3eGjMgG1aoK:KFbiLxYXMnkXAXG4XQK0WJuRjMgU

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:

sikxogr.exe

pid process

1924 sikxogr.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

436 netsh.exe

pid	process
1924	sikxogr.exe

pid	process
436	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\csijdspq\ImagePath = "C:\\Windows\\SysWOW64\\csijdspq\\sikxogr.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-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation file.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

sikxogr.exe

description pid process target process

PID 1924 set thread context of 3612 1924 sikxogr.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

1976 sc.exe
216 sc.exe
1284 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

3156 1704 WerFault.exe file.exe
3968 1924 WerFault.exe sikxogr.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	file.exe

description	pid	process	target process
PID 1924 set thread context of 3612	1924	sikxogr.exe	svchost.exe

pid	process
1976	sc.exe
216	sc.exe
1284	sc.exe

pid	pid_target	process	target process
3156	1704	WerFault.exe	file.exe
3968	1924	WerFault.exe	sikxogr.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exesikxogr.exe

description	pid	process	target process
PID 1704 wrote to memory of 1468	1704	file.exe	cmd.exe
PID 1704 wrote to memory of 1468	1704	file.exe	cmd.exe
PID 1704 wrote to memory of 1468	1704	file.exe	cmd.exe
PID 1704 wrote to memory of 1204	1704	file.exe	cmd.exe
PID 1704 wrote to memory of 1204	1704	file.exe	cmd.exe
PID 1704 wrote to memory of 1204	1704	file.exe	cmd.exe
PID 1704 wrote to memory of 1284	1704	file.exe	sc.exe
PID 1704 wrote to memory of 1284	1704	file.exe	sc.exe
PID 1704 wrote to memory of 1284	1704	file.exe	sc.exe
PID 1704 wrote to memory of 1976	1704	file.exe	sc.exe
PID 1704 wrote to memory of 1976	1704	file.exe	sc.exe
PID 1704 wrote to memory of 1976	1704	file.exe	sc.exe
PID 1704 wrote to memory of 216	1704	file.exe	sc.exe
PID 1704 wrote to memory of 216	1704	file.exe	sc.exe
PID 1704 wrote to memory of 216	1704	file.exe	sc.exe
PID 1704 wrote to memory of 436	1704	file.exe	netsh.exe
PID 1704 wrote to memory of 436	1704	file.exe	netsh.exe
PID 1704 wrote to memory of 436	1704	file.exe	netsh.exe
PID 1924 wrote to memory of 3612	1924	sikxogr.exe	svchost.exe
PID 1924 wrote to memory of 3612	1924	sikxogr.exe	svchost.exe
PID 1924 wrote to memory of 3612	1924	sikxogr.exe	svchost.exe
PID 1924 wrote to memory of 3612	1924	sikxogr.exe	svchost.exe
PID 1924 wrote to memory of 3612	1924	sikxogr.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:1704

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\csijdspq\
2⤵
PID:1468

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sikxogr.exe" C:\Windows\SysWOW64\csijdspq\
2⤵
PID:1204

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create csijdspq binPath= "C:\Windows\SysWOW64\csijdspq\sikxogr.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1284

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description csijdspq "wifi internet conection"
2⤵
- Launches sc.exe
PID:1976

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start csijdspq
2⤵
- Launches sc.exe
PID:216

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:436

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1704 -s 1036
2⤵
- Program crash
PID:3156

C:\Windows\SysWOW64\csijdspq\sikxogr.exe
C:\Windows\SysWOW64\csijdspq\sikxogr.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1924

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:3612

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1924 -s 508
2⤵
- Program crash
PID:3968

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 1704 -ip 1704
1⤵
PID:1320

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 1924 -ip 1924
1⤵
PID:5072

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

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\sikxogr.exe
Filesize
11.3MB

MD5
7e9327c807cd6c560e8205878b981e7e

SHA1
3241cb5a5139c5b5d73f65cc9424edefeae85b62

SHA256
35ee5982a3bc12b7e6603e68bf5efed7f994fb11410f7193355c7a604263b9f8

SHA512
379690d7f72d8da5628fa65c75aa54f12c7e9ec6a3b29f0b65dfdd8cd001fbf83bb72c14b857cc98bf03f351ba664cc174eec1f60e12fc62f85ebfc1e9830a52

Download Submit
C:\Windows\SysWOW64\csijdspq\sikxogr.exe
Filesize
11.3MB

MD5
7e9327c807cd6c560e8205878b981e7e

SHA1
3241cb5a5139c5b5d73f65cc9424edefeae85b62

SHA256
35ee5982a3bc12b7e6603e68bf5efed7f994fb11410f7193355c7a604263b9f8

SHA512
379690d7f72d8da5628fa65c75aa54f12c7e9ec6a3b29f0b65dfdd8cd001fbf83bb72c14b857cc98bf03f351ba664cc174eec1f60e12fc62f85ebfc1e9830a52

Download Submit
memory/216-141-0x0000000000000000-mapping.dmp

Download
memory/436-143-0x0000000000000000-mapping.dmp

Download
memory/1204-137-0x0000000000000000-mapping.dmp

Download
memory/1284-139-0x0000000000000000-mapping.dmp

Download
memory/1468-133-0x0000000000000000-mapping.dmp

Download
memory/1704-144-0x0000000000400000-0x000000000044A000-memory.dmp

Filesize
296KB

Download
memory/1704-136-0x0000000000400000-0x000000000044A000-memory.dmp

Filesize
296KB

Download
memory/1704-135-0x0000000000450000-0x0000000000463000-memory.dmp

Filesize
76KB

Download
memory/1704-134-0x0000000000487000-0x000000000049C000-memory.dmp

Filesize
84KB

Download
memory/1924-149-0x0000000000831000-0x0000000000847000-memory.dmp

Filesize
88KB

Download
memory/1924-150-0x0000000000400000-0x000000000044A000-memory.dmp

Filesize
296KB

Download
memory/1976-140-0x0000000000000000-mapping.dmp

Download
memory/3612-145-0x0000000000000000-mapping.dmp

Download
memory/3612-146-0x0000000000F50000-0x0000000000F65000-memory.dmp

Filesize
84KB

Download
memory/3612-151-0x0000000000F50000-0x0000000000F65000-memory.dmp

Filesize
84KB

Download
memory/3612-152-0x0000000000F50000-0x0000000000F65000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing