tofsee | 5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946

General

Target

5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
Size

10.5MB
MD5

222c77202aaadbae9167f125d5235c93
SHA1

bdaa4533ebd52e7c4936cc2612ae9cc850ccdd6c
SHA256

5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946
SHA512

834691c22d611de565c4b147728f74d7cc24b623c5bdda53f43e6fc129cce765a43cfb31982618e5fb341e676adf2eb816192b1fcb26a1cd00399429db46bbbe

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

43.231.4.7

lazystax.ru

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\ewhrtnk = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

zvnnkzym.exe

pid process

1892 zvnnkzym.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1812 netsh.exe

pid	process
1892	zvnnkzym.exe

pid	process
1812	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\ewhrtnk\ImagePath = "C:\\Windows\\SysWOW64\\ewhrtnk\\zvnnkzym.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1836 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

zvnnkzym.exe

description pid process target process

PID 1892 set thread context of 1836 1892 zvnnkzym.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

1748 sc.exe
1908 sc.exe
784 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
1836	svchost.exe

description	pid	process	target process
PID 1892 set thread context of 1836	1892	zvnnkzym.exe	svchost.exe

pid	process
1748	sc.exe
1908	sc.exe
784	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exezvnnkzym.exe

description	pid	process	target process
PID 2024 wrote to memory of 1064	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	cmd.exe
PID 2024 wrote to memory of 1064	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	cmd.exe
PID 2024 wrote to memory of 1064	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	cmd.exe
PID 2024 wrote to memory of 1064	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	cmd.exe
PID 2024 wrote to memory of 1456	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	cmd.exe
PID 2024 wrote to memory of 1456	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	cmd.exe
PID 2024 wrote to memory of 1456	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	cmd.exe
PID 2024 wrote to memory of 1456	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	cmd.exe
PID 2024 wrote to memory of 1748	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 2024 wrote to memory of 1748	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 2024 wrote to memory of 1748	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 2024 wrote to memory of 1748	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 2024 wrote to memory of 1908	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 2024 wrote to memory of 1908	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 2024 wrote to memory of 1908	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 2024 wrote to memory of 1908	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 2024 wrote to memory of 784	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 2024 wrote to memory of 784	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 2024 wrote to memory of 784	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 2024 wrote to memory of 784	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 2024 wrote to memory of 1812	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	netsh.exe
PID 2024 wrote to memory of 1812	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	netsh.exe
PID 2024 wrote to memory of 1812	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	netsh.exe
PID 2024 wrote to memory of 1812	2024	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	netsh.exe
PID 1892 wrote to memory of 1836	1892	zvnnkzym.exe	svchost.exe
PID 1892 wrote to memory of 1836	1892	zvnnkzym.exe	svchost.exe
PID 1892 wrote to memory of 1836	1892	zvnnkzym.exe	svchost.exe
PID 1892 wrote to memory of 1836	1892	zvnnkzym.exe	svchost.exe
PID 1892 wrote to memory of 1836	1892	zvnnkzym.exe	svchost.exe
PID 1892 wrote to memory of 1836	1892	zvnnkzym.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
"C:\Users\Admin\AppData\Local\Temp\5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2024

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ewhrtnk\
2⤵
PID:1064

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zvnnkzym.exe" C:\Windows\SysWOW64\ewhrtnk\
2⤵
PID:1456

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create ewhrtnk binPath= "C:\Windows\SysWOW64\ewhrtnk\zvnnkzym.exe /d\"C:\Users\Admin\AppData\Local\Temp\5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1748

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description ewhrtnk "wifi internet conection"
2⤵
- Launches sc.exe
PID:1908

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start ewhrtnk
2⤵
- Launches sc.exe
PID:784

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:1812

C:\Windows\SysWOW64\ewhrtnk\zvnnkzym.exe
C:\Windows\SysWOW64\ewhrtnk\zvnnkzym.exe /d"C:\Users\Admin\AppData\Local\Temp\5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1892

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:1836

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\zvnnkzym.exe
Filesize
13.8MB

MD5
57154b1f9a253b3306e78eb3d0dd2695

SHA1
f764b883fff21b19a48fee9fc86a2f09b707f4c5

SHA256
548dcb4695d3e68d2155e8c94d3b516a24f1dfd7b12f02c875bb921ca691bbbb

SHA512
d59e68579a7a96f2d09b4ec7017a8d8576202f475ed3cb8d0193822016786392f7bedd5f62b5827efd85a2ec7c53bc47aa73e0daee89c6a3872174b2d7b2d1e4

Download Submit
C:\Windows\SysWOW64\ewhrtnk\zvnnkzym.exe
Filesize
13.8MB

MD5
57154b1f9a253b3306e78eb3d0dd2695

SHA1
f764b883fff21b19a48fee9fc86a2f09b707f4c5

SHA256
548dcb4695d3e68d2155e8c94d3b516a24f1dfd7b12f02c875bb921ca691bbbb

SHA512
d59e68579a7a96f2d09b4ec7017a8d8576202f475ed3cb8d0193822016786392f7bedd5f62b5827efd85a2ec7c53bc47aa73e0daee89c6a3872174b2d7b2d1e4

Download Submit
memory/784-63-0x0000000000000000-mapping.dmp

Download
memory/1064-57-0x0000000000000000-mapping.dmp

Download
memory/1456-59-0x0000000000000000-mapping.dmp

Download
memory/1748-61-0x0000000000000000-mapping.dmp

Download
memory/1812-65-0x0000000000000000-mapping.dmp

Download
memory/1836-69-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1836-80-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1836-79-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1836-72-0x0000000000089A6B-mapping.dmp

Download
memory/1836-71-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1892-77-0x0000000000400000-0x0000000002321000-memory.dmp

Filesize
31.1MB

Download
memory/1892-74-0x00000000023D9000-0x00000000023E7000-memory.dmp

Filesize
56KB

Download
memory/1908-62-0x0000000000000000-mapping.dmp

Download
memory/2024-55-0x0000000002469000-0x0000000002477000-memory.dmp

Filesize
56KB

Download
memory/2024-67-0x0000000000400000-0x0000000002321000-memory.dmp

Filesize
31.1MB

Download
memory/2024-66-0x0000000002469000-0x0000000002477000-memory.dmp

Filesize
56KB

Download
memory/2024-56-0x0000000000230000-0x0000000000243000-memory.dmp

Filesize
76KB

Download
memory/2024-54-0x0000000074DD1000-0x0000000074DD3000-memory.dmp

Filesize
8KB

Download
memory/2024-58-0x0000000000400000-0x0000000002321000-memory.dmp

Filesize
31.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads