tofsee | 27e3ed0b63c7aaf1cdef8ff971fdf5c60fbf4507ef55343096f94ff6feb5f516

General

Target

0a0dd74c400e848fcf84d1217695746f.exe
Size

313KB
MD5

0a0dd74c400e848fcf84d1217695746f
SHA1

87a35d0bceabe086f8bfb0b286dd678a9c93d35a
SHA256

27e3ed0b63c7aaf1cdef8ff971fdf5c60fbf4507ef55343096f94ff6feb5f516
SHA512

4bb6df5908a505f5d2a1871f86db31ec7883bf4cecd25ad5fcf4c3f7410fbede7487b12dad1e8442b83953510aad074ba04a89f067620c07d0acc89f1973454b
SSDEEP

3072:8pXIEUbI/4pLTdJdBaLh6MbISGRiKT87mk/PGXZuZQ2y5gW5cF3PF1YWUqqT:MNU8ApLTd7BcpbIRR1sjFqpSdtS7

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\oketpgrf = "0"	svchost.exe

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

1208 netsh.exe

pid	process
1208	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\oketpgrf\ImagePath = "C:\\Windows\\SysWOW64\\oketpgrf\\vcbowwei.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1008 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

vcbowwei.exe

pid process

656 vcbowwei.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

vcbowwei.exe

description pid process target process

PID 656 set thread context of 1008 656 vcbowwei.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

472 sc.exe
672 sc.exe
1884 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
1008	svchost.exe

pid	process
656	vcbowwei.exe

description	pid	process	target process
PID 656 set thread context of 1008	656	vcbowwei.exe	svchost.exe

pid	process
472	sc.exe
672	sc.exe
1884	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

0a0dd74c400e848fcf84d1217695746f.exevcbowwei.exe

description	pid	process	target process
PID 2024 wrote to memory of 872	2024	0a0dd74c400e848fcf84d1217695746f.exe	cmd.exe
PID 2024 wrote to memory of 872	2024	0a0dd74c400e848fcf84d1217695746f.exe	cmd.exe
PID 2024 wrote to memory of 872	2024	0a0dd74c400e848fcf84d1217695746f.exe	cmd.exe
PID 2024 wrote to memory of 872	2024	0a0dd74c400e848fcf84d1217695746f.exe	cmd.exe
PID 2024 wrote to memory of 2032	2024	0a0dd74c400e848fcf84d1217695746f.exe	cmd.exe
PID 2024 wrote to memory of 2032	2024	0a0dd74c400e848fcf84d1217695746f.exe	cmd.exe
PID 2024 wrote to memory of 2032	2024	0a0dd74c400e848fcf84d1217695746f.exe	cmd.exe
PID 2024 wrote to memory of 2032	2024	0a0dd74c400e848fcf84d1217695746f.exe	cmd.exe
PID 2024 wrote to memory of 472	2024	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 2024 wrote to memory of 472	2024	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 2024 wrote to memory of 472	2024	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 2024 wrote to memory of 472	2024	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 2024 wrote to memory of 672	2024	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 2024 wrote to memory of 672	2024	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 2024 wrote to memory of 672	2024	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 2024 wrote to memory of 672	2024	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 2024 wrote to memory of 1884	2024	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 2024 wrote to memory of 1884	2024	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 2024 wrote to memory of 1884	2024	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 2024 wrote to memory of 1884	2024	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 2024 wrote to memory of 1208	2024	0a0dd74c400e848fcf84d1217695746f.exe	netsh.exe
PID 2024 wrote to memory of 1208	2024	0a0dd74c400e848fcf84d1217695746f.exe	netsh.exe
PID 2024 wrote to memory of 1208	2024	0a0dd74c400e848fcf84d1217695746f.exe	netsh.exe
PID 2024 wrote to memory of 1208	2024	0a0dd74c400e848fcf84d1217695746f.exe	netsh.exe
PID 656 wrote to memory of 1008	656	vcbowwei.exe	svchost.exe
PID 656 wrote to memory of 1008	656	vcbowwei.exe	svchost.exe
PID 656 wrote to memory of 1008	656	vcbowwei.exe	svchost.exe
PID 656 wrote to memory of 1008	656	vcbowwei.exe	svchost.exe
PID 656 wrote to memory of 1008	656	vcbowwei.exe	svchost.exe
PID 656 wrote to memory of 1008	656	vcbowwei.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\0a0dd74c400e848fcf84d1217695746f.exe
"C:\Users\Admin\AppData\Local\Temp\0a0dd74c400e848fcf84d1217695746f.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2024

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\oketpgrf\
2⤵
PID:872

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vcbowwei.exe" C:\Windows\SysWOW64\oketpgrf\
2⤵
PID:2032

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create oketpgrf binPath= "C:\Windows\SysWOW64\oketpgrf\vcbowwei.exe /d\"C:\Users\Admin\AppData\Local\Temp\0a0dd74c400e848fcf84d1217695746f.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:472

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description oketpgrf "wifi internet conection"
2⤵
- Launches sc.exe
PID:672

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start oketpgrf
2⤵
- Launches sc.exe
PID:1884

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:1208

C:\Windows\SysWOW64\oketpgrf\vcbowwei.exe
C:\Windows\SysWOW64\oketpgrf\vcbowwei.exe /d"C:\Users\Admin\AppData\Local\Temp\0a0dd74c400e848fcf84d1217695746f.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:656

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:1008

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

Disabling Security Tools

1

T1089

Modify Registry

2

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\vcbowwei.exe
Filesize
12.6MB

MD5
df38f7e8a839226b2b2b590249df8c45

SHA1
43974f27aea19a8e8fc0cef6a51349da00ec6bf6

SHA256
9e182a11d42fe7c7dc2bb807d35dbeb0afe82dd7085e451267f8f755dd63cb47

SHA512
5286c8d76a7b18721e3812a2eb7fe2da4bc4081ac56b203894dc7a1718427aa9195512528ea7b371469c645668c5beeb29b2e1d6dbc312b68636c87b109cf6ac

Download Submit
C:\Windows\SysWOW64\oketpgrf\vcbowwei.exe
Filesize
12.6MB

MD5
df38f7e8a839226b2b2b590249df8c45

SHA1
43974f27aea19a8e8fc0cef6a51349da00ec6bf6

SHA256
9e182a11d42fe7c7dc2bb807d35dbeb0afe82dd7085e451267f8f755dd63cb47

SHA512
5286c8d76a7b18721e3812a2eb7fe2da4bc4081ac56b203894dc7a1718427aa9195512528ea7b371469c645668c5beeb29b2e1d6dbc312b68636c87b109cf6ac

Download Submit
memory/656-65-0x0000000000400000-0x00000000006E9000-memory.dmp

Filesize
2.9MB

Download
memory/1008-62-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1008-61-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1008-63-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1008-67-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1008-68-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1008-69-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1008-70-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2024-56-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2024-60-0x0000000000400000-0x00000000006E9000-memory.dmp

Filesize
2.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads