tofsee | ddeaca50e21813ebb8ee743cca315e0f1d7a05900d4369b652f68f5baeaa6f38

General

Target

file.exe
Size

167KB
MD5

068af12a4fde5998014522a0e8eaeb06
SHA1

e51abb1d6ef5a889b398a670c60f20cec46f7f95
SHA256

ddeaca50e21813ebb8ee743cca315e0f1d7a05900d4369b652f68f5baeaa6f38
SHA512

9b931733b2b6a478d639aa5cca89e36fe37d3a225277e985ae845a8362bd14186e59f879435ecd3a975010df752c9e8e9c8cedf62a760c87246383e22bdad71c
SSDEEP

3072:zBl9IavvucboHS5J1VQErTHNXrDDJkbV5vw:h/HLboi/QEPVDlkB

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

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\qlvgismk = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

ysucysyr.exe

pid process

564 ysucysyr.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1512 netsh.exe

pid	process
564	ysucysyr.exe

pid	process
1512	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\qlvgismk\ImagePath = "C:\\Windows\\SysWOW64\\qlvgismk\\ysucysyr.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

932 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

ysucysyr.exe

description pid process target process

PID 564 set thread context of 932 564 ysucysyr.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

280 sc.exe
452 sc.exe
1764 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
932	svchost.exe

description	pid	process	target process
PID 564 set thread context of 932	564	ysucysyr.exe	svchost.exe

pid	process
280	sc.exe
452	sc.exe
1764	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exeysucysyr.exe

description	pid	process	target process
PID 1324 wrote to memory of 1200	1324	file.exe	cmd.exe
PID 1324 wrote to memory of 1200	1324	file.exe	cmd.exe
PID 1324 wrote to memory of 1200	1324	file.exe	cmd.exe
PID 1324 wrote to memory of 1200	1324	file.exe	cmd.exe
PID 1324 wrote to memory of 1748	1324	file.exe	cmd.exe
PID 1324 wrote to memory of 1748	1324	file.exe	cmd.exe
PID 1324 wrote to memory of 1748	1324	file.exe	cmd.exe
PID 1324 wrote to memory of 1748	1324	file.exe	cmd.exe
PID 1324 wrote to memory of 280	1324	file.exe	sc.exe
PID 1324 wrote to memory of 280	1324	file.exe	sc.exe
PID 1324 wrote to memory of 280	1324	file.exe	sc.exe
PID 1324 wrote to memory of 280	1324	file.exe	sc.exe
PID 1324 wrote to memory of 452	1324	file.exe	sc.exe
PID 1324 wrote to memory of 452	1324	file.exe	sc.exe
PID 1324 wrote to memory of 452	1324	file.exe	sc.exe
PID 1324 wrote to memory of 452	1324	file.exe	sc.exe
PID 1324 wrote to memory of 1764	1324	file.exe	sc.exe
PID 1324 wrote to memory of 1764	1324	file.exe	sc.exe
PID 1324 wrote to memory of 1764	1324	file.exe	sc.exe
PID 1324 wrote to memory of 1764	1324	file.exe	sc.exe
PID 1324 wrote to memory of 1512	1324	file.exe	netsh.exe
PID 1324 wrote to memory of 1512	1324	file.exe	netsh.exe
PID 1324 wrote to memory of 1512	1324	file.exe	netsh.exe
PID 1324 wrote to memory of 1512	1324	file.exe	netsh.exe
PID 564 wrote to memory of 932	564	ysucysyr.exe	svchost.exe
PID 564 wrote to memory of 932	564	ysucysyr.exe	svchost.exe
PID 564 wrote to memory of 932	564	ysucysyr.exe	svchost.exe
PID 564 wrote to memory of 932	564	ysucysyr.exe	svchost.exe
PID 564 wrote to memory of 932	564	ysucysyr.exe	svchost.exe
PID 564 wrote to memory of 932	564	ysucysyr.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1324

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\qlvgismk\
2⤵
PID:1200

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ysucysyr.exe" C:\Windows\SysWOW64\qlvgismk\
2⤵
PID:1748

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create qlvgismk binPath= "C:\Windows\SysWOW64\qlvgismk\ysucysyr.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:280

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description qlvgismk "wifi internet conection"
2⤵
- Launches sc.exe
PID:452

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start qlvgismk
2⤵
- Launches sc.exe
PID:1764

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:1512

C:\Windows\SysWOW64\qlvgismk\ysucysyr.exe
C:\Windows\SysWOW64\qlvgismk\ysucysyr.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:564

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:932

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\ysucysyr.exe
Filesize
14.6MB

MD5
32973f53f40ab53eb200b001c8fbaae0

SHA1
ba68de6e12a340a0ccd9ff342626ce0e71fe5380

SHA256
ccf20521f190a2425204a0d7fc7fa060b5068014c00dd3517777e6dac2b2adf3

SHA512
88aecc376896a68397e0d4a8d9362dd23ffd621145e9a9886b84b1f81d9b8a37c083fa76d3553cedfc3b75a6ca99ddce9dd4abe00a5b4a6f50a44780cc51b678

Download Submit
C:\Windows\SysWOW64\qlvgismk\ysucysyr.exe
Filesize
14.6MB

MD5
32973f53f40ab53eb200b001c8fbaae0

SHA1
ba68de6e12a340a0ccd9ff342626ce0e71fe5380

SHA256
ccf20521f190a2425204a0d7fc7fa060b5068014c00dd3517777e6dac2b2adf3

SHA512
88aecc376896a68397e0d4a8d9362dd23ffd621145e9a9886b84b1f81d9b8a37c083fa76d3553cedfc3b75a6ca99ddce9dd4abe00a5b4a6f50a44780cc51b678

Download Submit
memory/280-61-0x0000000000000000-mapping.dmp

Download
memory/452-62-0x0000000000000000-mapping.dmp

Download
memory/564-77-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/564-76-0x000000000089B000-0x00000000008AB000-memory.dmp

Filesize
64KB

Download
memory/932-72-0x00000000000D9A6B-mapping.dmp

Download
memory/932-71-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/932-79-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/932-78-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/932-69-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/1200-55-0x0000000000000000-mapping.dmp

Download
memory/1324-57-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/1324-66-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/1324-54-0x00000000752B1000-0x00000000752B3000-memory.dmp

Filesize
8KB

Download
memory/1324-56-0x00000000008CB000-0x00000000008DB000-memory.dmp

Filesize
64KB

Download
memory/1324-58-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/1512-65-0x0000000000000000-mapping.dmp

Download
memory/1748-59-0x0000000000000000-mapping.dmp

Download
memory/1764-63-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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