tofsee | c841cb96a9a0648f1d9df6b16c244bc1e80aca79eebd77e733c2c33ddcef5e1a

General

Target

file.exe
Size

147KB
MD5

1eb05ec5bc5982ebc88aa1ad6b69fb46
SHA1

fcfc2f0c0f5cc446961959165b6dc01b29b23701
SHA256

c841cb96a9a0648f1d9df6b16c244bc1e80aca79eebd77e733c2c33ddcef5e1a
SHA512

c591a73be6073da3ee9a2f80336ba386c31c9f5f08332d5b8a6ec959bb8a6cc929dae51309832c648af44c69e712082f930e11ae3324a528bcfe5ff1265bb9f6
SSDEEP

3072:fkJxzH6d2wC065TLWslukoo1Cl7U8onB:f4i2wklukooS7U8

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\mgzpyqyf = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

gmzunuhc.exe

pid process

1768 gmzunuhc.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1676 netsh.exe

pid	process
1768	gmzunuhc.exe

pid	process
1676	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\mgzpyqyf\ImagePath = "C:\\Windows\\SysWOW64\\mgzpyqyf\\gmzunuhc.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

868 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

gmzunuhc.exe

description pid process target process

PID 1768 set thread context of 868 1768 gmzunuhc.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

1376 sc.exe
864 sc.exe
320 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
868	svchost.exe

description	pid	process	target process
PID 1768 set thread context of 868	1768	gmzunuhc.exe	svchost.exe

pid	process
1376	sc.exe
864	sc.exe
320	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exegmzunuhc.exe

description	pid	process	target process
PID 1456 wrote to memory of 1472	1456	file.exe	cmd.exe
PID 1456 wrote to memory of 1472	1456	file.exe	cmd.exe
PID 1456 wrote to memory of 1472	1456	file.exe	cmd.exe
PID 1456 wrote to memory of 1472	1456	file.exe	cmd.exe
PID 1456 wrote to memory of 1680	1456	file.exe	cmd.exe
PID 1456 wrote to memory of 1680	1456	file.exe	cmd.exe
PID 1456 wrote to memory of 1680	1456	file.exe	cmd.exe
PID 1456 wrote to memory of 1680	1456	file.exe	cmd.exe
PID 1456 wrote to memory of 1376	1456	file.exe	sc.exe
PID 1456 wrote to memory of 1376	1456	file.exe	sc.exe
PID 1456 wrote to memory of 1376	1456	file.exe	sc.exe
PID 1456 wrote to memory of 1376	1456	file.exe	sc.exe
PID 1456 wrote to memory of 864	1456	file.exe	sc.exe
PID 1456 wrote to memory of 864	1456	file.exe	sc.exe
PID 1456 wrote to memory of 864	1456	file.exe	sc.exe
PID 1456 wrote to memory of 864	1456	file.exe	sc.exe
PID 1456 wrote to memory of 320	1456	file.exe	sc.exe
PID 1456 wrote to memory of 320	1456	file.exe	sc.exe
PID 1456 wrote to memory of 320	1456	file.exe	sc.exe
PID 1456 wrote to memory of 320	1456	file.exe	sc.exe
PID 1456 wrote to memory of 1676	1456	file.exe	netsh.exe
PID 1456 wrote to memory of 1676	1456	file.exe	netsh.exe
PID 1456 wrote to memory of 1676	1456	file.exe	netsh.exe
PID 1456 wrote to memory of 1676	1456	file.exe	netsh.exe
PID 1768 wrote to memory of 868	1768	gmzunuhc.exe	svchost.exe
PID 1768 wrote to memory of 868	1768	gmzunuhc.exe	svchost.exe
PID 1768 wrote to memory of 868	1768	gmzunuhc.exe	svchost.exe
PID 1768 wrote to memory of 868	1768	gmzunuhc.exe	svchost.exe
PID 1768 wrote to memory of 868	1768	gmzunuhc.exe	svchost.exe
PID 1768 wrote to memory of 868	1768	gmzunuhc.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:1456

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mgzpyqyf\
2⤵
PID:1472

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gmzunuhc.exe" C:\Windows\SysWOW64\mgzpyqyf\
2⤵
PID:1680

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create mgzpyqyf binPath= "C:\Windows\SysWOW64\mgzpyqyf\gmzunuhc.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1376

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description mgzpyqyf "wifi internet conection"
2⤵
- Launches sc.exe
PID:864

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start mgzpyqyf
2⤵
- Launches sc.exe
PID:320

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:1676

C:\Windows\SysWOW64\mgzpyqyf\gmzunuhc.exe
C:\Windows\SysWOW64\mgzpyqyf\gmzunuhc.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1768

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:868

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

New Service

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

New Service

1

T1050

Defense Evasion

Disabling Security Tools

Modify Registry

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\gmzunuhc.exe
Filesize
12.2MB

MD5
81a37510b37604c7d6de430f4de2f88e

SHA1
8957d17d99a60f195bb011fe6c0661661de23c05

SHA256
4495eb5b7a9e933c5b8df6f61c5523ad28226cda55e7533f1d9e6c8910ae9647

SHA512
6c4c14be74fb532e0a8dfb37e816f47aee1e8a6346db6f98b6d09b3a31e29041431b183aac7d74a6ef9f3d826aa6c0951cf629e01f014c5025b3ffa044870767

Download Submit
C:\Windows\SysWOW64\mgzpyqyf\gmzunuhc.exe
Filesize
12.2MB

MD5
81a37510b37604c7d6de430f4de2f88e

SHA1
8957d17d99a60f195bb011fe6c0661661de23c05

SHA256
4495eb5b7a9e933c5b8df6f61c5523ad28226cda55e7533f1d9e6c8910ae9647

SHA512
6c4c14be74fb532e0a8dfb37e816f47aee1e8a6346db6f98b6d09b3a31e29041431b183aac7d74a6ef9f3d826aa6c0951cf629e01f014c5025b3ffa044870767

Download Submit
memory/320-64-0x0000000000000000-mapping.dmp

Download
memory/864-63-0x0000000000000000-mapping.dmp

Download
memory/868-73-0x0000000000089A6B-mapping.dmp

Download
memory/868-70-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/868-80-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/868-79-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/868-72-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1376-62-0x0000000000000000-mapping.dmp

Download
memory/1456-58-0x00000000003A0000-0x00000000003B3000-memory.dmp

Filesize
76KB

Download
memory/1456-67-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/1456-57-0x0000000000230000-0x0000000000330000-memory.dmp

Filesize
1024KB

Download
memory/1456-55-0x0000000075B51000-0x0000000075B53000-memory.dmp

Filesize
8KB

Download
memory/1456-59-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/1472-56-0x0000000000000000-mapping.dmp

Download
memory/1676-66-0x0000000000000000-mapping.dmp

Download
memory/1680-60-0x0000000000000000-mapping.dmp

Download
memory/1768-76-0x0000000000BBB000-0x0000000000BCB000-memory.dmp

Filesize
64KB

Download
memory/1768-78-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads