tofsee | cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796

General

Target

cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe
Size

192KB
MD5

d4e0a9ff19277f89090ea5e4e558f7ef
SHA1

cd3a22ef3f2a0a4f3b01b95b13c4946045e0cd63
SHA256

cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796
SHA512

585d62799f6fe5ce68018c20e8aecb6154959bfb8fc02a69dd9a3b249f94f85c1600d60cb2b74365fe4426de4f172fbc0df7e7e789bb06386895eb7bdf1241be
SSDEEP

3072:9rbR6e6hM46gUIJ5qbMlCzgyQ4Iu0mE4GrtmxRs9E3AZxpR/c:9Mc46gUL4Bg01xxvp

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:

ryycdnxi.exe

pid process

1544 ryycdnxi.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1644 netsh.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

ryycdnxi.exe

description pid process target process

PID 1544 set thread context of 1648 1544 ryycdnxi.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

696 sc.exe
384 sc.exe
1888 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
1544	ryycdnxi.exe

pid	process
1644	netsh.exe

description	pid	process	target process
PID 1544 set thread context of 1648	1544	ryycdnxi.exe	svchost.exe

pid	process
696	sc.exe
384	sc.exe
1888	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exeryycdnxi.exe

description	pid	process	target process
PID 1664 wrote to memory of 896	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	cmd.exe
PID 1664 wrote to memory of 896	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	cmd.exe
PID 1664 wrote to memory of 896	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	cmd.exe
PID 1664 wrote to memory of 896	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	cmd.exe
PID 1664 wrote to memory of 520	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	cmd.exe
PID 1664 wrote to memory of 520	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	cmd.exe
PID 1664 wrote to memory of 520	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	cmd.exe
PID 1664 wrote to memory of 520	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	cmd.exe
PID 1664 wrote to memory of 696	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	sc.exe
PID 1664 wrote to memory of 696	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	sc.exe
PID 1664 wrote to memory of 696	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	sc.exe
PID 1664 wrote to memory of 696	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	sc.exe
PID 1664 wrote to memory of 384	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	sc.exe
PID 1664 wrote to memory of 384	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	sc.exe
PID 1664 wrote to memory of 384	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	sc.exe
PID 1664 wrote to memory of 384	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	sc.exe
PID 1664 wrote to memory of 1888	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	sc.exe
PID 1664 wrote to memory of 1888	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	sc.exe
PID 1664 wrote to memory of 1888	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	sc.exe
PID 1664 wrote to memory of 1888	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	sc.exe
PID 1544 wrote to memory of 1648	1544	ryycdnxi.exe	svchost.exe
PID 1544 wrote to memory of 1648	1544	ryycdnxi.exe	svchost.exe
PID 1544 wrote to memory of 1648	1544	ryycdnxi.exe	svchost.exe
PID 1544 wrote to memory of 1648	1544	ryycdnxi.exe	svchost.exe
PID 1664 wrote to memory of 1644	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	netsh.exe
PID 1664 wrote to memory of 1644	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	netsh.exe
PID 1664 wrote to memory of 1644	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	netsh.exe
PID 1664 wrote to memory of 1644	1664	cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe	netsh.exe
PID 1544 wrote to memory of 1648	1544	ryycdnxi.exe	svchost.exe
PID 1544 wrote to memory of 1648	1544	ryycdnxi.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe
"C:\Users\Admin\AppData\Local\Temp\cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1664

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gxuzzfyy\
2⤵
PID:896

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ryycdnxi.exe" C:\Windows\SysWOW64\gxuzzfyy\
2⤵
PID:520

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create gxuzzfyy binPath= "C:\Windows\SysWOW64\gxuzzfyy\ryycdnxi.exe /d\"C:\Users\Admin\AppData\Local\Temp\cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:696

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description gxuzzfyy "wifi internet conection"
2⤵
- Launches sc.exe
PID:384

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start gxuzzfyy
2⤵
- Launches sc.exe
PID:1888

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:1644

C:\Windows\SysWOW64\gxuzzfyy\ryycdnxi.exe
C:\Windows\SysWOW64\gxuzzfyy\ryycdnxi.exe /d"C:\Users\Admin\AppData\Local\Temp\cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1544

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
PID:1648

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

New Service

1

T1050

Modify Existing Service

1

T1031

Privilege Escalation

New Service

1

T1050

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\ryycdnxi.exe
Filesize
12.0MB

MD5
6b1be3387d26e8227c4507580057f7e8

SHA1
1ca746a93f5415c7cfd190d6229485ff8167b1e6

SHA256
874ce72876dc1828b8273751877634fdb57c4315f8c8f4869df9aa75f1249a67

SHA512
b67d94d0fa2861326b32c1dfbbfb561dd67f9a001f75c6864ed2f1bab1a6984c8f60018e5ca8ec1739ee7ece3fe3e855890fde972a7ebc0a85d4832908a92ce5

Download Submit
C:\Windows\SysWOW64\gxuzzfyy\ryycdnxi.exe
Filesize
12.0MB

MD5
6b1be3387d26e8227c4507580057f7e8

SHA1
1ca746a93f5415c7cfd190d6229485ff8167b1e6

SHA256
874ce72876dc1828b8273751877634fdb57c4315f8c8f4869df9aa75f1249a67

SHA512
b67d94d0fa2861326b32c1dfbbfb561dd67f9a001f75c6864ed2f1bab1a6984c8f60018e5ca8ec1739ee7ece3fe3e855890fde972a7ebc0a85d4832908a92ce5

Download Submit
memory/384-62-0x0000000000000000-mapping.dmp

Download
memory/520-59-0x0000000000000000-mapping.dmp

Download
memory/696-61-0x0000000000000000-mapping.dmp

Download
memory/896-57-0x0000000000000000-mapping.dmp

Download
memory/1544-67-0x00000000002E0000-0x00000000002F3000-memory.dmp

Filesize
76KB

Download
memory/1544-78-0x00000000005FB000-0x000000000060C000-memory.dmp

Filesize
68KB

Download
memory/1544-79-0x0000000000400000-0x0000000000466000-memory.dmp

Filesize
408KB

Download
memory/1544-68-0x0000000000400000-0x0000000000466000-memory.dmp

Filesize
408KB

Download
memory/1544-66-0x00000000005FB000-0x000000000060C000-memory.dmp

Filesize
68KB

Download
memory/1644-71-0x0000000000000000-mapping.dmp

Download
memory/1648-72-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/1648-69-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/1648-73-0x00000000000C9A6B-mapping.dmp

Download
memory/1664-55-0x00000000002B0000-0x00000000002C3000-memory.dmp

Filesize
76KB

Download
memory/1664-58-0x0000000000400000-0x0000000000466000-memory.dmp

Filesize
408KB

Download
memory/1664-74-0x000000000050B000-0x000000000051C000-memory.dmp

Filesize
68KB

Download
memory/1664-76-0x0000000000400000-0x0000000000466000-memory.dmp

Filesize
408KB

Download
memory/1664-56-0x0000000075591000-0x0000000075593000-memory.dmp

Filesize
8KB

Download
memory/1664-54-0x000000000050B000-0x000000000051C000-memory.dmp

Filesize
68KB

Download
memory/1888-63-0x0000000000000000-mapping.dmp

Download

Analysis

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