tofsee | dc0ec3405d05046753c376f33fcd545d03b4781983d4b26103de9419b4334963

General

Target

file.exe
Size

147KB
MD5

245a32c6b70bf744448625ca6d897a57
SHA1

67a7ca7893d555651eb6a38bc22fb9aeacffcec2
SHA256

dc0ec3405d05046753c376f33fcd545d03b4781983d4b26103de9419b4334963
SHA512

aa40eb9fd15e087b346086421b6efdbecc97980868d1404fa32e8ca90a118f3986aef668554ba67badf1dc58ef88c1d688ebe193fed3d3f5dd435d392d3665af
SSDEEP

3072:GFuoANbriTl655frf0zvNDoM2bTXtFW5mMSjv:JbbrHT0zxnoTeo

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\yzpawmhm = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

jczhyrli.exe

pid process

1748 jczhyrli.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1784 netsh.exe

pid	process
1748	jczhyrli.exe

pid	process
1784	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\yzpawmhm\ImagePath = "C:\\Windows\\SysWOW64\\yzpawmhm\\jczhyrli.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

568 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

jczhyrli.exe

description pid process target process

PID 1748 set thread context of 568 1748 jczhyrli.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

1448 sc.exe
612 sc.exe
832 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
568	svchost.exe

description	pid	process	target process
PID 1748 set thread context of 568	1748	jczhyrli.exe	svchost.exe

pid	process
1448	sc.exe
612	sc.exe
832	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exejczhyrli.exe

description	pid	process	target process
PID 364 wrote to memory of 1700	364	file.exe	cmd.exe
PID 364 wrote to memory of 1700	364	file.exe	cmd.exe
PID 364 wrote to memory of 1700	364	file.exe	cmd.exe
PID 364 wrote to memory of 1700	364	file.exe	cmd.exe
PID 364 wrote to memory of 1288	364	file.exe	cmd.exe
PID 364 wrote to memory of 1288	364	file.exe	cmd.exe
PID 364 wrote to memory of 1288	364	file.exe	cmd.exe
PID 364 wrote to memory of 1288	364	file.exe	cmd.exe
PID 364 wrote to memory of 1448	364	file.exe	sc.exe
PID 364 wrote to memory of 1448	364	file.exe	sc.exe
PID 364 wrote to memory of 1448	364	file.exe	sc.exe
PID 364 wrote to memory of 1448	364	file.exe	sc.exe
PID 364 wrote to memory of 612	364	file.exe	sc.exe
PID 364 wrote to memory of 612	364	file.exe	sc.exe
PID 364 wrote to memory of 612	364	file.exe	sc.exe
PID 364 wrote to memory of 612	364	file.exe	sc.exe
PID 364 wrote to memory of 832	364	file.exe	sc.exe
PID 364 wrote to memory of 832	364	file.exe	sc.exe
PID 364 wrote to memory of 832	364	file.exe	sc.exe
PID 364 wrote to memory of 832	364	file.exe	sc.exe
PID 364 wrote to memory of 1784	364	file.exe	netsh.exe
PID 364 wrote to memory of 1784	364	file.exe	netsh.exe
PID 364 wrote to memory of 1784	364	file.exe	netsh.exe
PID 364 wrote to memory of 1784	364	file.exe	netsh.exe
PID 1748 wrote to memory of 568	1748	jczhyrli.exe	svchost.exe
PID 1748 wrote to memory of 568	1748	jczhyrli.exe	svchost.exe
PID 1748 wrote to memory of 568	1748	jczhyrli.exe	svchost.exe
PID 1748 wrote to memory of 568	1748	jczhyrli.exe	svchost.exe
PID 1748 wrote to memory of 568	1748	jczhyrli.exe	svchost.exe
PID 1748 wrote to memory of 568	1748	jczhyrli.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:364

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yzpawmhm\
2⤵
PID:1700

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jczhyrli.exe" C:\Windows\SysWOW64\yzpawmhm\
2⤵
PID:1288

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create yzpawmhm binPath= "C:\Windows\SysWOW64\yzpawmhm\jczhyrli.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1448

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description yzpawmhm "wifi internet conection"
2⤵
- Launches sc.exe
PID:612

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start yzpawmhm
2⤵
- Launches sc.exe
PID:832

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:1784

C:\Windows\SysWOW64\yzpawmhm\jczhyrli.exe
C:\Windows\SysWOW64\yzpawmhm\jczhyrli.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1748

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:568

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\jczhyrli.exe
Filesize
12.7MB

MD5
763e5cd464c29d5d5711985e0db76651

SHA1
cf62ca1949307448312a49250d4ccaabd9e817ad

SHA256
7a862da041b6bb005baded6b8f56b62b10ee181d0afa7c8f4aeaf06f5111d908

SHA512
511932bc9e58293930a4b70efb55cfe4ba79dd8fe5c95d7b52504b6c6c4476dd7fa4ff7b06ad9c41f66f8dbcd2f78c8ab06eeca3854fe4824045d2c2e00baf00

Download Submit
C:\Windows\SysWOW64\yzpawmhm\jczhyrli.exe
Filesize
12.7MB

MD5
763e5cd464c29d5d5711985e0db76651

SHA1
cf62ca1949307448312a49250d4ccaabd9e817ad

SHA256
7a862da041b6bb005baded6b8f56b62b10ee181d0afa7c8f4aeaf06f5111d908

SHA512
511932bc9e58293930a4b70efb55cfe4ba79dd8fe5c95d7b52504b6c6c4476dd7fa4ff7b06ad9c41f66f8dbcd2f78c8ab06eeca3854fe4824045d2c2e00baf00

Download Submit
memory/364-57-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/364-54-0x0000000000BEB000-0x0000000000BFC000-memory.dmp

Filesize
68KB

Download
memory/364-69-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/364-68-0x0000000000BEB000-0x0000000000BFC000-memory.dmp

Filesize
68KB

Download
memory/364-55-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/364-61-0x0000000000BEB000-0x0000000000BFC000-memory.dmp

Filesize
68KB

Download
memory/364-62-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/364-56-0x0000000076681000-0x0000000076683000-memory.dmp

Filesize
8KB

Download
memory/568-83-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/568-72-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/568-81-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/568-75-0x0000000000089A6B-mapping.dmp

Download
memory/568-74-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/612-64-0x0000000000000000-mapping.dmp

Download
memory/832-65-0x0000000000000000-mapping.dmp

Download
memory/1288-59-0x0000000000000000-mapping.dmp

Download
memory/1448-63-0x0000000000000000-mapping.dmp

Download
memory/1700-58-0x0000000000000000-mapping.dmp

Download
memory/1748-71-0x000000000026B000-0x000000000027C000-memory.dmp

Filesize
68KB

Download
memory/1748-78-0x000000000026B000-0x000000000027C000-memory.dmp

Filesize
68KB

Download
memory/1748-77-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/1784-67-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads