tofsee | b30d031ba00884201f134275fba470347847c79c202730a99aba28ba0af5164d

General

Target

Backdoor.Win32.Tofsee.exe
Size

156KB
MD5

5a1b9badb9af104e121379fe3c7f7e4c
SHA1

0d4e9cc2af85424606ddb981c3060f19f7aa834b
SHA256

b30d031ba00884201f134275fba470347847c79c202730a99aba28ba0af5164d
SHA512

049b178dd0a9697e94cba8895dc7ab28f4a754140f777781fdc2213348874f47234e8d5addf332c52396a20ead98ad1e147855a9b0abc4c2d18e6cc239d0454a
SSDEEP

3072:jcyXKgAPWYnaqlhdlEMOMk3M1HhyOGxx:jcQKgAvaudyMOv2yO

Score

10^/10

tofsee persistence trojan

Malware Config

Extracted

Family

tofsee

C2

43.225.38.217

111.121.193.242

188.190.120.101

188.165.132.183

213.155.0.208

rgtryhbgddtyh.biz

wertdghbyrukl.ch

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Executes dropped EXE 2 IoCs

Processes:

otsvmrjf.exeotsvmrjf.exe

pid process

696 otsvmrjf.exe
1692 otsvmrjf.exe
Loads dropped DLL 2 IoCs

Processes:

Backdoor.Win32.Tofsee.exe

pid process

520 Backdoor.Win32.Tofsee.exe
520 Backdoor.Win32.Tofsee.exe

pid	process
696	otsvmrjf.exe
1692	otsvmrjf.exe

pid	process
520	Backdoor.Win32.Tofsee.exe
520	Backdoor.Win32.Tofsee.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

Backdoor.Win32.Tofsee.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3948302646-268491222-1934009652-1000\Software\Microsoft\Windows\CurrentVersion\Run\MSConfig = "\"C:\\Users\\Admin\\otsvmrjf.exe\""	Backdoor.Win32.Tofsee.exe

Suspicious use of SetThreadContext 4 IoCs

Processes:

Backdoor.Win32.Tofsee.exeotsvmrjf.exeotsvmrjf.exe

description	pid	process	target process
PID 1384 set thread context of 520	1384	Backdoor.Win32.Tofsee.exe	Backdoor.Win32.Tofsee.exe
PID 696 set thread context of 1692	696	otsvmrjf.exe	otsvmrjf.exe
PID 696 set thread context of 1692	696	otsvmrjf.exe	otsvmrjf.exe
PID 1692 set thread context of 760	1692	otsvmrjf.exe	svchost.exe

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

System Information Discovery
T1082
Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery
T1018

Processes:

PING.EXEPING.EXEPING.EXE

pid process

1984 PING.EXE
1416 PING.EXE
1576 PING.EXE
Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

Backdoor.Win32.Tofsee.exeotsvmrjf.exe

pid process

1384 Backdoor.Win32.Tofsee.exe
696 otsvmrjf.exe

pid	process
1984	PING.EXE
1416	PING.EXE
1576	PING.EXE

pid	process
1384	Backdoor.Win32.Tofsee.exe
696	otsvmrjf.exe

Suspicious use of WriteProcessMemory 48 IoCs

Processes:

Backdoor.Win32.Tofsee.exeBackdoor.Win32.Tofsee.exeotsvmrjf.exeotsvmrjf.execmd.exe

description	pid	process	target process
PID 1384 wrote to memory of 520	1384	Backdoor.Win32.Tofsee.exe	Backdoor.Win32.Tofsee.exe
PID 1384 wrote to memory of 520	1384	Backdoor.Win32.Tofsee.exe	Backdoor.Win32.Tofsee.exe
PID 1384 wrote to memory of 520	1384	Backdoor.Win32.Tofsee.exe	Backdoor.Win32.Tofsee.exe
PID 1384 wrote to memory of 520	1384	Backdoor.Win32.Tofsee.exe	Backdoor.Win32.Tofsee.exe
PID 1384 wrote to memory of 520	1384	Backdoor.Win32.Tofsee.exe	Backdoor.Win32.Tofsee.exe
PID 1384 wrote to memory of 520	1384	Backdoor.Win32.Tofsee.exe	Backdoor.Win32.Tofsee.exe
PID 1384 wrote to memory of 520	1384	Backdoor.Win32.Tofsee.exe	Backdoor.Win32.Tofsee.exe
PID 1384 wrote to memory of 520	1384	Backdoor.Win32.Tofsee.exe	Backdoor.Win32.Tofsee.exe
PID 1384 wrote to memory of 520	1384	Backdoor.Win32.Tofsee.exe	Backdoor.Win32.Tofsee.exe
PID 1384 wrote to memory of 520	1384	Backdoor.Win32.Tofsee.exe	Backdoor.Win32.Tofsee.exe
PID 1384 wrote to memory of 520	1384	Backdoor.Win32.Tofsee.exe	Backdoor.Win32.Tofsee.exe
PID 520 wrote to memory of 696	520	Backdoor.Win32.Tofsee.exe	otsvmrjf.exe
PID 520 wrote to memory of 696	520	Backdoor.Win32.Tofsee.exe	otsvmrjf.exe
PID 520 wrote to memory of 696	520	Backdoor.Win32.Tofsee.exe	otsvmrjf.exe
PID 520 wrote to memory of 696	520	Backdoor.Win32.Tofsee.exe	otsvmrjf.exe
PID 696 wrote to memory of 1692	696	otsvmrjf.exe	otsvmrjf.exe
PID 696 wrote to memory of 1692	696	otsvmrjf.exe	otsvmrjf.exe
PID 696 wrote to memory of 1692	696	otsvmrjf.exe	otsvmrjf.exe
PID 696 wrote to memory of 1692	696	otsvmrjf.exe	otsvmrjf.exe
PID 696 wrote to memory of 1692	696	otsvmrjf.exe	otsvmrjf.exe
PID 696 wrote to memory of 1692	696	otsvmrjf.exe	otsvmrjf.exe
PID 696 wrote to memory of 1692	696	otsvmrjf.exe	otsvmrjf.exe
PID 696 wrote to memory of 1692	696	otsvmrjf.exe	otsvmrjf.exe
PID 696 wrote to memory of 1692	696	otsvmrjf.exe	otsvmrjf.exe
PID 696 wrote to memory of 1692	696	otsvmrjf.exe	otsvmrjf.exe
PID 696 wrote to memory of 1692	696	otsvmrjf.exe	otsvmrjf.exe
PID 1692 wrote to memory of 760	1692	otsvmrjf.exe	svchost.exe
PID 1692 wrote to memory of 760	1692	otsvmrjf.exe	svchost.exe
PID 1692 wrote to memory of 760	1692	otsvmrjf.exe	svchost.exe
PID 1692 wrote to memory of 760	1692	otsvmrjf.exe	svchost.exe
PID 1692 wrote to memory of 760	1692	otsvmrjf.exe	svchost.exe
PID 1692 wrote to memory of 760	1692	otsvmrjf.exe	svchost.exe
PID 520 wrote to memory of 1404	520	Backdoor.Win32.Tofsee.exe	cmd.exe
PID 520 wrote to memory of 1404	520	Backdoor.Win32.Tofsee.exe	cmd.exe
PID 520 wrote to memory of 1404	520	Backdoor.Win32.Tofsee.exe	cmd.exe
PID 520 wrote to memory of 1404	520	Backdoor.Win32.Tofsee.exe	cmd.exe
PID 1404 wrote to memory of 1984	1404	cmd.exe	PING.EXE
PID 1404 wrote to memory of 1984	1404	cmd.exe	PING.EXE
PID 1404 wrote to memory of 1984	1404	cmd.exe	PING.EXE
PID 1404 wrote to memory of 1984	1404	cmd.exe	PING.EXE
PID 1404 wrote to memory of 1416	1404	cmd.exe	PING.EXE
PID 1404 wrote to memory of 1416	1404	cmd.exe	PING.EXE
PID 1404 wrote to memory of 1416	1404	cmd.exe	PING.EXE
PID 1404 wrote to memory of 1416	1404	cmd.exe	PING.EXE
PID 1404 wrote to memory of 1576	1404	cmd.exe	PING.EXE
PID 1404 wrote to memory of 1576	1404	cmd.exe	PING.EXE
PID 1404 wrote to memory of 1576	1404	cmd.exe	PING.EXE
PID 1404 wrote to memory of 1576	1404	cmd.exe	PING.EXE

C:\Users\Admin\AppData\Local\Temp\Backdoor.Win32.Tofsee.exe
"C:\Users\Admin\AppData\Local\Temp\Backdoor.Win32.Tofsee.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1384

C:\Users\Admin\AppData\Local\Temp\Backdoor.Win32.Tofsee.exe
"C:\Users\Admin\AppData\Local\Temp\Backdoor.Win32.Tofsee.exe"
2⤵
- Loads dropped DLL
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:520

C:\Users\Admin\otsvmrjf.exe
"C:\Users\Admin\otsvmrjf.exe"
3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:696

C:\Users\Admin\otsvmrjf.exe
"C:\Users\Admin\otsvmrjf.exe"
4⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1692

C:\Windows\SysWOW64\svchost.exe
svchost.exe
5⤵
PID:760

C:\Windows\SysWOW64\cmd.exe
cmd /c ""C:\Users\Admin\AppData\Local\Temp\8340.bat" "
3⤵
- Suspicious use of WriteProcessMemory
PID:1404

C:\Windows\SysWOW64\PING.EXE
ping 127.0.0.1
4⤵
- Runs ping.exe
PID:1984

C:\Windows\SysWOW64\PING.EXE
ping 127.0.0.1
4⤵
- Runs ping.exe
PID:1416

C:\Windows\SysWOW64\PING.EXE
ping 127.0.0.1
4⤵
- Runs ping.exe
PID:1576

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Remote System Discovery

1

T1018

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\8340.bat
Filesize
216B

MD5
09df633913a0e95a0b74bcb990a9598a

SHA1
4feb02b98298b7ed9eabb55cc00b76dd5bd9ad85

SHA256
df2b4923e7429d4681082218e29f0b5af94ac6fa247dec5f9cb8f3bb708b967f

SHA512
14a57df6f0e95bee58c3b4c56cfea00c2e0c8e27365eff99d5feae28e02c1d49f0c11f7cc45d3ad744d163868bd76e2ef882a336b43ce68ddfdbecfb96b9fe71

Download Submit
C:\Users\Admin\AppData\Local\Temp\8340.bat
Filesize
216B

MD5
09df633913a0e95a0b74bcb990a9598a

SHA1
4feb02b98298b7ed9eabb55cc00b76dd5bd9ad85

SHA256
df2b4923e7429d4681082218e29f0b5af94ac6fa247dec5f9cb8f3bb708b967f

SHA512
14a57df6f0e95bee58c3b4c56cfea00c2e0c8e27365eff99d5feae28e02c1d49f0c11f7cc45d3ad744d163868bd76e2ef882a336b43ce68ddfdbecfb96b9fe71

Download Submit
C:\Users\Admin\otsvmrjf.exe
Filesize
45.6MB

MD5
ec69e31e88a1bd352cee621d0a6bb1ff

SHA1
5f9fb035c71424b869ae8d4058dfd768ed80cefe

SHA256
235daaf1dc95405d349b22e9167cf7ed015878fee91f63f72094c48700783383

SHA512
0295c270ba50b342cc4f5b7235d9e6d21c88e778c65604e705c9911d6310f29c40aaad1fdcfc5d9d9a5edd16730fc157b83d349f6f445569ada654a26026f07d

Download Submit
C:\Users\Admin\otsvmrjf.exe
Filesize
45.6MB

MD5
ec69e31e88a1bd352cee621d0a6bb1ff

SHA1
5f9fb035c71424b869ae8d4058dfd768ed80cefe

SHA256
235daaf1dc95405d349b22e9167cf7ed015878fee91f63f72094c48700783383

SHA512
0295c270ba50b342cc4f5b7235d9e6d21c88e778c65604e705c9911d6310f29c40aaad1fdcfc5d9d9a5edd16730fc157b83d349f6f445569ada654a26026f07d

Download Submit
C:\Users\Admin\otsvmrjf.exe
Filesize
45.6MB

MD5
ec69e31e88a1bd352cee621d0a6bb1ff

SHA1
5f9fb035c71424b869ae8d4058dfd768ed80cefe

SHA256
235daaf1dc95405d349b22e9167cf7ed015878fee91f63f72094c48700783383

SHA512
0295c270ba50b342cc4f5b7235d9e6d21c88e778c65604e705c9911d6310f29c40aaad1fdcfc5d9d9a5edd16730fc157b83d349f6f445569ada654a26026f07d

Download Submit
C:\Users\Admin\otsvmrjf.exe
Filesize
45.6MB

MD5
ec69e31e88a1bd352cee621d0a6bb1ff

SHA1
5f9fb035c71424b869ae8d4058dfd768ed80cefe

SHA256
235daaf1dc95405d349b22e9167cf7ed015878fee91f63f72094c48700783383

SHA512
0295c270ba50b342cc4f5b7235d9e6d21c88e778c65604e705c9911d6310f29c40aaad1fdcfc5d9d9a5edd16730fc157b83d349f6f445569ada654a26026f07d

Download Submit
\Users\Admin\otsvmrjf.exe
Filesize
45.6MB

MD5
ec69e31e88a1bd352cee621d0a6bb1ff

SHA1
5f9fb035c71424b869ae8d4058dfd768ed80cefe

SHA256
235daaf1dc95405d349b22e9167cf7ed015878fee91f63f72094c48700783383

SHA512
0295c270ba50b342cc4f5b7235d9e6d21c88e778c65604e705c9911d6310f29c40aaad1fdcfc5d9d9a5edd16730fc157b83d349f6f445569ada654a26026f07d

Download Submit
\Users\Admin\otsvmrjf.exe
Filesize
45.6MB

MD5
ec69e31e88a1bd352cee621d0a6bb1ff

SHA1
5f9fb035c71424b869ae8d4058dfd768ed80cefe

SHA256
235daaf1dc95405d349b22e9167cf7ed015878fee91f63f72094c48700783383

SHA512
0295c270ba50b342cc4f5b7235d9e6d21c88e778c65604e705c9911d6310f29c40aaad1fdcfc5d9d9a5edd16730fc157b83d349f6f445569ada654a26026f07d

Download Submit
memory/520-56-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/520-65-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/520-73-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/760-99-0x0000000000080000-0x0000000000092000-memory.dmp

Filesize
72KB

Download
memory/760-92-0x0000000000080000-0x0000000000092000-memory.dmp

Filesize
72KB

Download
memory/760-94-0x0000000000080000-0x0000000000092000-memory.dmp

Filesize
72KB

Download
memory/760-93-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/760-100-0x0000000000080000-0x0000000000092000-memory.dmp

Filesize
72KB

Download
memory/760-104-0x00000000000A0000-0x00000000000A1000-memory.dmp

Filesize
4KB

Download
memory/760-105-0x0000000000080000-0x0000000000092000-memory.dmp

Filesize
72KB

Download
memory/760-106-0x0000000000080000-0x0000000000092000-memory.dmp

Filesize
72KB

Download
memory/760-119-0x0000000000080000-0x0000000000092000-memory.dmp

Filesize
72KB

Download
memory/1692-95-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1692-90-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1692-87-0x0000000000400000-0x0000000000400000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads