tofsee | 5b43c20c3b20018c4659f99f4be427e09e37dc0c4c3a12c62603519880c64f30

General

Target

c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe
Size

233KB
MD5

9f72ad79bba9d398a150be4b676c624b
SHA1

f06218c9fb624ba6a8040846c1a888e6dacc6fb6
SHA256

c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981
SHA512

bd7a919b1773115756c1b795fc3111132f7acd8290e2d82c25e6b6d03510bc61f7736c3b1fee2794bd3492e103121018d83565d2dea79287481b99f31bdbb393
SSDEEP

3072:1oCTZcw8fGJiR21K9Np5Y4xL1JTp0C2bhUQiGkRo8DegwT:1ob/vFF2bhd8l

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
Creates new service(s) 1 TTPs
persistence

Windows Service
T1543.003
Modifies Windows Firewall 2 TTPs 1 IoCs
evasion

Windows Service
T1543.003

Disable or Modify System Firewall
T1562.004

Processes:

netsh.exe

pid process

2628 netsh.exe

pid	process
2628	netsh.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe

Executes dropped EXE 1 IoCs

Processes:

dgzkktuu.exe

pid process

1100 dgzkktuu.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

4584 sc.exe
2576 sc.exe
1668 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

2340 2368 WerFault.exe c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe

pid	process
1100	dgzkktuu.exe

pid	process
4584	sc.exe
2576	sc.exe
1668	sc.exe

pid	pid_target	process	target process
2340	2368	WerFault.exe	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe

Suspicious use of WriteProcessMemory 18 IoCs

Processes:

c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe

description	pid	process	target process
PID 2368 wrote to memory of 4284	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	cmd.exe
PID 2368 wrote to memory of 4284	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	cmd.exe
PID 2368 wrote to memory of 4284	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	cmd.exe
PID 2368 wrote to memory of 3352	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	cmd.exe
PID 2368 wrote to memory of 3352	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	cmd.exe
PID 2368 wrote to memory of 3352	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	cmd.exe
PID 2368 wrote to memory of 4584	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	sc.exe
PID 2368 wrote to memory of 4584	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	sc.exe
PID 2368 wrote to memory of 4584	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	sc.exe
PID 2368 wrote to memory of 2576	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	sc.exe
PID 2368 wrote to memory of 2576	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	sc.exe
PID 2368 wrote to memory of 2576	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	sc.exe
PID 2368 wrote to memory of 1668	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	sc.exe
PID 2368 wrote to memory of 1668	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	sc.exe
PID 2368 wrote to memory of 1668	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	sc.exe
PID 2368 wrote to memory of 2628	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	netsh.exe
PID 2368 wrote to memory of 2628	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	netsh.exe
PID 2368 wrote to memory of 2628	2368	c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe	netsh.exe

C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe
"C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2368

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lperffvk\
2⤵
PID:4284

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dgzkktuu.exe" C:\Windows\SysWOW64\lperffvk\
2⤵
PID:3352

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create lperffvk binPath= "C:\Windows\SysWOW64\lperffvk\dgzkktuu.exe /d\"C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:4584

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description lperffvk "wifi internet conection"
2⤵
- Launches sc.exe
PID:2576

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start lperffvk
2⤵
- Launches sc.exe
PID:1668

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:2628

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2368 -s 1040
2⤵
- Program crash
PID:2340

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3644 --field-trial-handle=2252,i,16504368816373493055,9578615028378602855,262144 --variations-seed-version /prefetch:8
1⤵
PID:2248

C:\Windows\SysWOW64\lperffvk\dgzkktuu.exe
C:\Windows\SysWOW64\lperffvk\dgzkktuu.exe /d"C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe"
1⤵
- Executes dropped EXE
PID:1100

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 2368 -ip 2368
1⤵
PID:1900

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Privilege Escalation

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Defense Evasion

Impair Defenses

1

T1562

Disable or Modify System Firewall

1

T1562.004

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\dgzkktuu.exe
Filesize
12.6MB

MD5
f427bf205318891ecd18f60cb4663502

SHA1
2c785119566e7ae42c18f82d814700509794e43b

SHA256
b14de998814d8e442f1cde35bdaadc0826783bcfc9ffb35afebad6f55aec9882

SHA512
54bd16286a9bae7c55db9b8ed4daeabb9f55cef59f174b72cb9ec747e4d4962badf717e64828b315f44d5431d81005f8044225b819747cfb9bd716c8c79b7e23

Download Submit
memory/2368-1-0x0000000000500000-0x0000000000600000-memory.dmp

Filesize
1024KB

Download
memory/2368-2-0x0000000002070000-0x0000000002083000-memory.dmp

Filesize
76KB

Download
memory/2368-3-0x0000000000400000-0x000000000043F000-memory.dmp

Filesize
252KB

Download
memory/2368-4-0x0000000000400000-0x000000000043F000-memory.dmp

Filesize
252KB

Download
memory/2368-6-0x0000000000400000-0x000000000043F000-memory.dmp

Filesize
252KB

Download
memory/2368-9-0x0000000000400000-0x000000000043F000-memory.dmp

Filesize
252KB

Download
memory/2368-10-0x0000000000500000-0x0000000000600000-memory.dmp

Filesize
1024KB

Download
memory/2368-11-0x0000000002070000-0x0000000002083000-memory.dmp

Filesize
76KB

Download

Analysis

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