tofsee | a8ffadf2ab8d3c75298773b6b619a6e5cbfc9557592f2993195f82d12987f049

General

Target

de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe
Size

302KB
MD5

c47f32f68a1ca3309768b48ec98cd752
SHA1

ab24f2d6a2cacd0b807b2a174e4c43e8d629b32e
SHA256

de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b
SHA512

747db0d277eac21cdb2f51862fe861e27b444bdae4ed08bcc92a92d27c75c6ee602723fa102a3501f980bea18bd2c9a500113c6e9cf42d752240e145b1bd610d
SSDEEP

3072:Muy7xHO5Ur+3sfGjmvp8hPdJidlfZl8ebAGMR5zODTKchd+OH:xy7xHvrmsejm6d2NZlDAGMHOKcv+y

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\llxbydkj = "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

296 netsh.exe

pid	process
296	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\llxbydkj\ImagePath = "C:\\Windows\\SysWOW64\\llxbydkj\\xnnkwiyw.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1508 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

xnnkwiyw.exe

pid process

1552 xnnkwiyw.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

xnnkwiyw.exe

description pid process target process

PID 1552 set thread context of 1508 1552 xnnkwiyw.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

976 sc.exe
868 sc.exe
1736 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
1508	svchost.exe

pid	process
1552	xnnkwiyw.exe

description	pid	process	target process
PID 1552 set thread context of 1508	1552	xnnkwiyw.exe	svchost.exe

pid	process
976	sc.exe
868	sc.exe
1736	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exexnnkwiyw.exe

description	pid	process	target process
PID 2044 wrote to memory of 628	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	cmd.exe
PID 2044 wrote to memory of 628	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	cmd.exe
PID 2044 wrote to memory of 628	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	cmd.exe
PID 2044 wrote to memory of 628	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	cmd.exe
PID 2044 wrote to memory of 472	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	cmd.exe
PID 2044 wrote to memory of 472	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	cmd.exe
PID 2044 wrote to memory of 472	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	cmd.exe
PID 2044 wrote to memory of 472	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	cmd.exe
PID 2044 wrote to memory of 976	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	sc.exe
PID 2044 wrote to memory of 976	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	sc.exe
PID 2044 wrote to memory of 976	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	sc.exe
PID 2044 wrote to memory of 976	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	sc.exe
PID 2044 wrote to memory of 868	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	sc.exe
PID 2044 wrote to memory of 868	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	sc.exe
PID 2044 wrote to memory of 868	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	sc.exe
PID 2044 wrote to memory of 868	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	sc.exe
PID 2044 wrote to memory of 1736	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	sc.exe
PID 2044 wrote to memory of 1736	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	sc.exe
PID 2044 wrote to memory of 1736	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	sc.exe
PID 2044 wrote to memory of 1736	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	sc.exe
PID 2044 wrote to memory of 296	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	netsh.exe
PID 2044 wrote to memory of 296	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	netsh.exe
PID 2044 wrote to memory of 296	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	netsh.exe
PID 2044 wrote to memory of 296	2044	de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe	netsh.exe
PID 1552 wrote to memory of 1508	1552	xnnkwiyw.exe	svchost.exe
PID 1552 wrote to memory of 1508	1552	xnnkwiyw.exe	svchost.exe
PID 1552 wrote to memory of 1508	1552	xnnkwiyw.exe	svchost.exe
PID 1552 wrote to memory of 1508	1552	xnnkwiyw.exe	svchost.exe
PID 1552 wrote to memory of 1508	1552	xnnkwiyw.exe	svchost.exe
PID 1552 wrote to memory of 1508	1552	xnnkwiyw.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe
"C:\Users\Admin\AppData\Local\Temp\de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2044

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\llxbydkj\
2⤵
PID:628

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xnnkwiyw.exe" C:\Windows\SysWOW64\llxbydkj\
2⤵
PID:472

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create llxbydkj binPath= "C:\Windows\SysWOW64\llxbydkj\xnnkwiyw.exe /d\"C:\Users\Admin\AppData\Local\Temp\de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:976

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description llxbydkj "wifi internet conection"
2⤵
- Launches sc.exe
PID:868

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start llxbydkj
2⤵
- Launches sc.exe
PID:1736

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:296

C:\Windows\SysWOW64\llxbydkj\xnnkwiyw.exe
C:\Windows\SysWOW64\llxbydkj\xnnkwiyw.exe /d"C:\Users\Admin\AppData\Local\Temp\de3f27526eca92d8bab305d2942fbaf89d96b5fda6467dbf931b373868215b0b.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1552

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:1508

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\xnnkwiyw.exe
Filesize
12.8MB

MD5
6a4cad41e61809d83ab435d1e052a290

SHA1
ff900ad100bcca84de85714fc7b1e4883101d30d

SHA256
cd907683804d4c207ec0a55a8f0d4c1073458b49adb1759c4727b0e0b85f7dc9

SHA512
8193a3b546e0424a90352012d4356706d06c570f4aef80da1e93529a640d3a958eb5097c7a8f0cf2421bf39b0b88d56b604b69dc74c2fcb44d0233d29aada3a6

Download Submit
C:\Windows\SysWOW64\llxbydkj\xnnkwiyw.exe
Filesize
12.8MB

MD5
6a4cad41e61809d83ab435d1e052a290

SHA1
ff900ad100bcca84de85714fc7b1e4883101d30d

SHA256
cd907683804d4c207ec0a55a8f0d4c1073458b49adb1759c4727b0e0b85f7dc9

SHA512
8193a3b546e0424a90352012d4356706d06c570f4aef80da1e93529a640d3a958eb5097c7a8f0cf2421bf39b0b88d56b604b69dc74c2fcb44d0233d29aada3a6

Download Submit
memory/1508-70-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1508-73-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1508-72-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1508-71-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1508-64-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1508-65-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1508-66-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1552-68-0x0000000000400000-0x0000000000A5C000-memory.dmp

Filesize
6.4MB

Download
memory/2044-55-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2044-61-0x0000000000400000-0x0000000000A5C000-memory.dmp

Filesize
6.4MB

Download
memory/2044-59-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2044-58-0x0000000000400000-0x0000000000A5C000-memory.dmp

Filesize
6.4MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads