tofsee | 1fb5e05e383ce3b2950d93894f802b730a867f688d6af5d80f404956117d3e89

General

Target

file.exe
Size

276KB
MD5

68d3b1e67263b0d65c81e9738924c21d
SHA1

29ef6a67c445c7ba49c4206bfac2da03a9d8ac1b
SHA256

1fb5e05e383ce3b2950d93894f802b730a867f688d6af5d80f404956117d3e89
SHA512

1acdb17454cf8333b8d92d2263ba58f5fd079dd37a35df3b19ae51b6891fd9b23421fdf4a0347862d37dcf49343e7603486fb7509c6764f7bf5a5235935b7746
SSDEEP

3072:siRc48qyPDiLo4YXMtq5qsDm6JPWXylDBKJ+0h5h0jKPcWJME9hIh3eGjMgG1aoK:KFbiLxYXMnkXAXG4XQK0WJuRjMgU

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\ipxhorfa = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

gfefgqsv.exe

pid process

1952 gfefgqsv.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1552 netsh.exe

pid	process
1952	gfefgqsv.exe

pid	process
1552	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\ipxhorfa\ImagePath = "C:\\Windows\\SysWOW64\\ipxhorfa\\gfefgqsv.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

964 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

gfefgqsv.exe

description pid process target process

PID 1952 set thread context of 964 1952 gfefgqsv.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

1404 sc.exe
836 sc.exe
304 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
964	svchost.exe

description	pid	process	target process
PID 1952 set thread context of 964	1952	gfefgqsv.exe	svchost.exe

pid	process
1404	sc.exe
836	sc.exe
304	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exegfefgqsv.exe

description	pid	process	target process
PID 1336 wrote to memory of 268	1336	file.exe	cmd.exe
PID 1336 wrote to memory of 268	1336	file.exe	cmd.exe
PID 1336 wrote to memory of 268	1336	file.exe	cmd.exe
PID 1336 wrote to memory of 268	1336	file.exe	cmd.exe
PID 1336 wrote to memory of 568	1336	file.exe	cmd.exe
PID 1336 wrote to memory of 568	1336	file.exe	cmd.exe
PID 1336 wrote to memory of 568	1336	file.exe	cmd.exe
PID 1336 wrote to memory of 568	1336	file.exe	cmd.exe
PID 1336 wrote to memory of 1404	1336	file.exe	sc.exe
PID 1336 wrote to memory of 1404	1336	file.exe	sc.exe
PID 1336 wrote to memory of 1404	1336	file.exe	sc.exe
PID 1336 wrote to memory of 1404	1336	file.exe	sc.exe
PID 1336 wrote to memory of 836	1336	file.exe	sc.exe
PID 1336 wrote to memory of 836	1336	file.exe	sc.exe
PID 1336 wrote to memory of 836	1336	file.exe	sc.exe
PID 1336 wrote to memory of 836	1336	file.exe	sc.exe
PID 1336 wrote to memory of 304	1336	file.exe	sc.exe
PID 1336 wrote to memory of 304	1336	file.exe	sc.exe
PID 1336 wrote to memory of 304	1336	file.exe	sc.exe
PID 1336 wrote to memory of 304	1336	file.exe	sc.exe
PID 1336 wrote to memory of 1552	1336	file.exe	netsh.exe
PID 1336 wrote to memory of 1552	1336	file.exe	netsh.exe
PID 1336 wrote to memory of 1552	1336	file.exe	netsh.exe
PID 1336 wrote to memory of 1552	1336	file.exe	netsh.exe
PID 1952 wrote to memory of 964	1952	gfefgqsv.exe	svchost.exe
PID 1952 wrote to memory of 964	1952	gfefgqsv.exe	svchost.exe
PID 1952 wrote to memory of 964	1952	gfefgqsv.exe	svchost.exe
PID 1952 wrote to memory of 964	1952	gfefgqsv.exe	svchost.exe
PID 1952 wrote to memory of 964	1952	gfefgqsv.exe	svchost.exe
PID 1952 wrote to memory of 964	1952	gfefgqsv.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:1336

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ipxhorfa\
2⤵
PID:268

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gfefgqsv.exe" C:\Windows\SysWOW64\ipxhorfa\
2⤵
PID:568

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create ipxhorfa binPath= "C:\Windows\SysWOW64\ipxhorfa\gfefgqsv.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1404

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description ipxhorfa "wifi internet conection"
2⤵
- Launches sc.exe
PID:836

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start ipxhorfa
2⤵
- Launches sc.exe
PID:304

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:1552

C:\Windows\SysWOW64\ipxhorfa\gfefgqsv.exe
C:\Windows\SysWOW64\ipxhorfa\gfefgqsv.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1952

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:964

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\gfefgqsv.exe
Filesize
13.2MB

MD5
32ce2458cd3517802b48a3bbfb2eb989

SHA1
dd6ec87a2c3de5ff2a5f326830aaf78d7bac0aa7

SHA256
4625adb89bb6190d6cbee078ce6f0848ebd676a553b34d2385130203c6a73fc9

SHA512
b9d4371d9e118f306f38c29d7efee3fd8c89e70af2dcfe6d620a15adb1700e1a6078b3c05390d0ba178ee3b273ad74d9b94545a3e0bf505ef19e6aeaedd45770

Download Submit
C:\Windows\SysWOW64\ipxhorfa\gfefgqsv.exe
Filesize
13.2MB

MD5
32ce2458cd3517802b48a3bbfb2eb989

SHA1
dd6ec87a2c3de5ff2a5f326830aaf78d7bac0aa7

SHA256
4625adb89bb6190d6cbee078ce6f0848ebd676a553b34d2385130203c6a73fc9

SHA512
b9d4371d9e118f306f38c29d7efee3fd8c89e70af2dcfe6d620a15adb1700e1a6078b3c05390d0ba178ee3b273ad74d9b94545a3e0bf505ef19e6aeaedd45770

Download Submit
memory/268-55-0x0000000000000000-mapping.dmp

Download
memory/304-64-0x0000000000000000-mapping.dmp

Download
memory/568-59-0x0000000000000000-mapping.dmp

Download
memory/836-63-0x0000000000000000-mapping.dmp

Download
memory/964-74-0x0000000000089A6B-mapping.dmp

Download
memory/964-71-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/964-81-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/964-80-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/964-73-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1336-56-0x00000000005FA000-0x000000000060F000-memory.dmp

Filesize
84KB

Download
memory/1336-66-0x00000000005FA000-0x000000000060F000-memory.dmp

Filesize
84KB

Download
memory/1336-57-0x0000000000020000-0x0000000000033000-memory.dmp

Filesize
76KB

Download
memory/1336-67-0x0000000000400000-0x000000000044A000-memory.dmp

Filesize
296KB

Download
memory/1336-54-0x0000000075F01000-0x0000000075F03000-memory.dmp

Filesize
8KB

Download
memory/1336-58-0x0000000000400000-0x000000000044A000-memory.dmp

Filesize
296KB

Download
memory/1336-62-0x00000000005FA000-0x000000000060F000-memory.dmp

Filesize
84KB

Download
memory/1404-61-0x0000000000000000-mapping.dmp

Download
memory/1552-65-0x0000000000000000-mapping.dmp

Download
memory/1952-77-0x0000000000400000-0x000000000044A000-memory.dmp

Filesize
296KB

Download
memory/1952-75-0x00000000008AA000-0x00000000008BF000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads