tofsee | 72ddf1a00d4705c99c0d26668d6af55071dcddeb9c4da47f87e5c69dc1ef3e19

General

Target

file.exe
Size

350KB
MD5

e6c5a231ec3235d5020f4af44ee5f2b8
SHA1

ae7aeaf37397c4adf15eb839f3a69b0b64444e9f
SHA256

72ddf1a00d4705c99c0d26668d6af55071dcddeb9c4da47f87e5c69dc1ef3e19
SHA512

367668d17178bb47ab49afdd7d9ff73682cca7872920e587592f739b55805f056b3f93613bff6d359f84f4c0d18c6bc9ac461d30998dce865130ebec50380692
SSDEEP

6144:KHXLG/6QDZw2FGxTKrzXR8+zqrWuRjMgU:K3S/DK2sYzXR8/RQg

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\nhnhoikc = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

ihghisux.exe

pid process

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

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

428 netsh.exe

pid	process
1892	ihghisux.exe

pid	process
428	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\nhnhoikc\ImagePath = "C:\\Windows\\SysWOW64\\nhnhoikc\\ihghisux.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

592 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

ihghisux.exe

description pid process target process

PID 1892 set thread context of 592 1892 ihghisux.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

1288 sc.exe
2036 sc.exe
736 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
592	svchost.exe

description	pid	process	target process
PID 1892 set thread context of 592	1892	ihghisux.exe	svchost.exe

pid	process
1288	sc.exe
2036	sc.exe
736	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exeihghisux.exe

description	pid	process	target process
PID 892 wrote to memory of 1236	892	file.exe	cmd.exe
PID 892 wrote to memory of 1236	892	file.exe	cmd.exe
PID 892 wrote to memory of 1236	892	file.exe	cmd.exe
PID 892 wrote to memory of 1236	892	file.exe	cmd.exe
PID 892 wrote to memory of 1420	892	file.exe	cmd.exe
PID 892 wrote to memory of 1420	892	file.exe	cmd.exe
PID 892 wrote to memory of 1420	892	file.exe	cmd.exe
PID 892 wrote to memory of 1420	892	file.exe	cmd.exe
PID 892 wrote to memory of 1288	892	file.exe	sc.exe
PID 892 wrote to memory of 1288	892	file.exe	sc.exe
PID 892 wrote to memory of 1288	892	file.exe	sc.exe
PID 892 wrote to memory of 1288	892	file.exe	sc.exe
PID 892 wrote to memory of 2036	892	file.exe	sc.exe
PID 892 wrote to memory of 2036	892	file.exe	sc.exe
PID 892 wrote to memory of 2036	892	file.exe	sc.exe
PID 892 wrote to memory of 2036	892	file.exe	sc.exe
PID 892 wrote to memory of 736	892	file.exe	sc.exe
PID 892 wrote to memory of 736	892	file.exe	sc.exe
PID 892 wrote to memory of 736	892	file.exe	sc.exe
PID 892 wrote to memory of 736	892	file.exe	sc.exe
PID 892 wrote to memory of 428	892	file.exe	netsh.exe
PID 892 wrote to memory of 428	892	file.exe	netsh.exe
PID 892 wrote to memory of 428	892	file.exe	netsh.exe
PID 892 wrote to memory of 428	892	file.exe	netsh.exe
PID 1892 wrote to memory of 592	1892	ihghisux.exe	svchost.exe
PID 1892 wrote to memory of 592	1892	ihghisux.exe	svchost.exe
PID 1892 wrote to memory of 592	1892	ihghisux.exe	svchost.exe
PID 1892 wrote to memory of 592	1892	ihghisux.exe	svchost.exe
PID 1892 wrote to memory of 592	1892	ihghisux.exe	svchost.exe
PID 1892 wrote to memory of 592	1892	ihghisux.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:892

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nhnhoikc\
2⤵
PID:1236

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ihghisux.exe" C:\Windows\SysWOW64\nhnhoikc\
2⤵
PID:1420

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create nhnhoikc binPath= "C:\Windows\SysWOW64\nhnhoikc\ihghisux.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1288

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description nhnhoikc "wifi internet conection"
2⤵
- Launches sc.exe
PID:2036

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start nhnhoikc
2⤵
- Launches sc.exe
PID:736

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:428

C:\Windows\SysWOW64\nhnhoikc\ihghisux.exe
C:\Windows\SysWOW64\nhnhoikc\ihghisux.exe /d"C:\Users\Admin\AppData\Local\Temp\file.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:592

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\ihghisux.exe
Filesize
13.7MB

MD5
d1d47983cfa48dfee16d6b569b454d6f

SHA1
f64ae2a053ee34631e7c6b9a20dcec4579867734

SHA256
9d8050efe82922e8c737832814c6771c949a0b80936b4479640526083638b903

SHA512
b96eddf213d520c5437b7a6a0f978473aefa90ce2b9f5f817f5a07d34476b253d38711c6e9b8065e7c070d3d62d5b381a590d0847e6b793784bb5c211ebda61c

Download Submit
C:\Windows\SysWOW64\nhnhoikc\ihghisux.exe
Filesize
13.7MB

MD5
d1d47983cfa48dfee16d6b569b454d6f

SHA1
f64ae2a053ee34631e7c6b9a20dcec4579867734

SHA256
9d8050efe82922e8c737832814c6771c949a0b80936b4479640526083638b903

SHA512
b96eddf213d520c5437b7a6a0f978473aefa90ce2b9f5f817f5a07d34476b253d38711c6e9b8065e7c070d3d62d5b381a590d0847e6b793784bb5c211ebda61c

Download Submit
memory/428-65-0x0000000000000000-mapping.dmp

Download
memory/592-72-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/592-80-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/592-79-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/592-73-0x0000000000089A6B-mapping.dmp

Download
memory/592-70-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/736-63-0x0000000000000000-mapping.dmp

Download
memory/892-66-0x000000000061A000-0x000000000062F000-memory.dmp

Filesize
84KB

Download
memory/892-57-0x0000000000020000-0x0000000000033000-memory.dmp

Filesize
76KB

Download
memory/892-56-0x000000000061A000-0x000000000062F000-memory.dmp

Filesize
84KB

Download
memory/892-67-0x0000000000400000-0x000000000045D000-memory.dmp

Filesize
372KB

Download
memory/892-54-0x0000000075141000-0x0000000075143000-memory.dmp

Filesize
8KB

Download
memory/892-58-0x0000000000400000-0x000000000045D000-memory.dmp

Filesize
372KB

Download
memory/1236-55-0x0000000000000000-mapping.dmp

Download
memory/1288-61-0x0000000000000000-mapping.dmp

Download
memory/1420-59-0x0000000000000000-mapping.dmp

Download
memory/1892-76-0x000000000056A000-0x000000000057F000-memory.dmp

Filesize
84KB

Download
memory/1892-77-0x0000000000400000-0x000000000045D000-memory.dmp

Filesize
372KB

Download
memory/2036-62-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads