tofsee | eb83af89295470eacddb4854fdce4d921f814ad636e70648ddd3b03295463492

General

Target

yoepjxj2k.exe
Size

231KB
MD5

e24bde37506309010eaaa9cd16543deb
SHA1

7b3184f8b36410489725fab73d8f3b699811fcdd
SHA256

eb83af89295470eacddb4854fdce4d921f814ad636e70648ddd3b03295463492
SHA512

13a8697c00f591bf354e8e477b0248b6668d2c5e0ea98b5b390bd6922df94a67476d9e68e017ca685d0e0d14a0bd0ab1f127476d808aefc9c06199624f8fe421
SSDEEP

3072:kJqiwS9dIvHI/vMkB3ld6iV8/1F5MwmF7a19Zubmqv5NxFul5gR/8WI4Oh6Ixq:K53dEoHM43haF5MwEakhLCyR0Wy

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

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\vkgbbnol = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1360 netsh.exe

pid	process
1360	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\vkgbbnol\ImagePath = "C:\\Windows\\SysWOW64\\vkgbbnol\\bnzebhgu.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1244 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

bnzebhgu.exe

pid process

856 bnzebhgu.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

bnzebhgu.exe

description pid process target process

PID 856 set thread context of 1244 856 bnzebhgu.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

592 sc.exe
1256 sc.exe
1280 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
1244	svchost.exe

pid	process
856	bnzebhgu.exe

description	pid	process	target process
PID 856 set thread context of 1244	856	bnzebhgu.exe	svchost.exe

pid	process
592	sc.exe
1256	sc.exe
1280	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

yoepjxj2k.exebnzebhgu.exe

description	pid	process	target process
PID 924 wrote to memory of 872	924	yoepjxj2k.exe	cmd.exe
PID 924 wrote to memory of 872	924	yoepjxj2k.exe	cmd.exe
PID 924 wrote to memory of 872	924	yoepjxj2k.exe	cmd.exe
PID 924 wrote to memory of 872	924	yoepjxj2k.exe	cmd.exe
PID 924 wrote to memory of 980	924	yoepjxj2k.exe	cmd.exe
PID 924 wrote to memory of 980	924	yoepjxj2k.exe	cmd.exe
PID 924 wrote to memory of 980	924	yoepjxj2k.exe	cmd.exe
PID 924 wrote to memory of 980	924	yoepjxj2k.exe	cmd.exe
PID 924 wrote to memory of 592	924	yoepjxj2k.exe	sc.exe
PID 924 wrote to memory of 592	924	yoepjxj2k.exe	sc.exe
PID 924 wrote to memory of 592	924	yoepjxj2k.exe	sc.exe
PID 924 wrote to memory of 592	924	yoepjxj2k.exe	sc.exe
PID 924 wrote to memory of 1256	924	yoepjxj2k.exe	sc.exe
PID 924 wrote to memory of 1256	924	yoepjxj2k.exe	sc.exe
PID 924 wrote to memory of 1256	924	yoepjxj2k.exe	sc.exe
PID 924 wrote to memory of 1256	924	yoepjxj2k.exe	sc.exe
PID 924 wrote to memory of 1280	924	yoepjxj2k.exe	sc.exe
PID 924 wrote to memory of 1280	924	yoepjxj2k.exe	sc.exe
PID 924 wrote to memory of 1280	924	yoepjxj2k.exe	sc.exe
PID 924 wrote to memory of 1280	924	yoepjxj2k.exe	sc.exe
PID 856 wrote to memory of 1244	856	bnzebhgu.exe	svchost.exe
PID 856 wrote to memory of 1244	856	bnzebhgu.exe	svchost.exe
PID 856 wrote to memory of 1244	856	bnzebhgu.exe	svchost.exe
PID 856 wrote to memory of 1244	856	bnzebhgu.exe	svchost.exe
PID 924 wrote to memory of 1360	924	yoepjxj2k.exe	netsh.exe
PID 924 wrote to memory of 1360	924	yoepjxj2k.exe	netsh.exe
PID 924 wrote to memory of 1360	924	yoepjxj2k.exe	netsh.exe
PID 924 wrote to memory of 1360	924	yoepjxj2k.exe	netsh.exe
PID 856 wrote to memory of 1244	856	bnzebhgu.exe	svchost.exe
PID 856 wrote to memory of 1244	856	bnzebhgu.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\yoepjxj2k.exe
"C:\Users\Admin\AppData\Local\Temp\yoepjxj2k.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:924

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vkgbbnol\
2⤵
PID:872

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bnzebhgu.exe" C:\Windows\SysWOW64\vkgbbnol\
2⤵
PID:980

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create vkgbbnol binPath= "C:\Windows\SysWOW64\vkgbbnol\bnzebhgu.exe /d\"C:\Users\Admin\AppData\Local\Temp\yoepjxj2k.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:592

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description vkgbbnol "wifi internet conection"
2⤵
- Launches sc.exe
PID:1256

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start vkgbbnol
2⤵
- Launches sc.exe
PID:1280

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:1360

C:\Windows\SysWOW64\vkgbbnol\bnzebhgu.exe
C:\Windows\SysWOW64\vkgbbnol\bnzebhgu.exe /d"C:\Users\Admin\AppData\Local\Temp\yoepjxj2k.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:856

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:1244

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\bnzebhgu.exe
Filesize
10.8MB

MD5
b57d3ab35e0459844958f8668e7068ec

SHA1
1505d616fef5d75bb95459d1223a6b1e840ac464

SHA256
9fb5c665d733f646bd627deb485e42c5b2abf3a36ea32f3f0cfec9e9cb15c6f2

SHA512
e5a12eabb1398bf21ab6be29f5ce4a7627fa0c3000a37c22f7d161503f1a730a214aae598604fb1ebb875323af74e4a6f80285695fd5091d9d16d41902ce585e

Download Submit
C:\Windows\SysWOW64\vkgbbnol\bnzebhgu.exe
Filesize
10.8MB

MD5
b57d3ab35e0459844958f8668e7068ec

SHA1
1505d616fef5d75bb95459d1223a6b1e840ac464

SHA256
9fb5c665d733f646bd627deb485e42c5b2abf3a36ea32f3f0cfec9e9cb15c6f2

SHA512
e5a12eabb1398bf21ab6be29f5ce4a7627fa0c3000a37c22f7d161503f1a730a214aae598604fb1ebb875323af74e4a6f80285695fd5091d9d16d41902ce585e

Download Submit
memory/856-65-0x0000000000400000-0x00000000006BA000-memory.dmp

Filesize
2.7MB

Download
memory/924-55-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/924-63-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/924-61-0x0000000000400000-0x00000000006BA000-memory.dmp

Filesize
2.7MB

Download
memory/1244-62-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1244-64-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1244-60-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1244-67-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1244-68-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1244-69-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1244-70-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1244-71-0x0000000000080000-0x0000000000095000-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