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
Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

qtcnnjjg.exe

pid process

1564 qtcnnjjg.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

4628 netsh.exe

pid	process
1564	qtcnnjjg.exe

pid	process
4628	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\kesfnmff\ImagePath = "C:\\Windows\\SysWOW64\\kesfnmff\\qtcnnjjg.exe"	svchost.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:

file.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation file.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

qtcnnjjg.exe

description pid process target process

PID 1564 set thread context of 220 1564 qtcnnjjg.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

4332 sc.exe
4660 sc.exe
5044 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid pid_target process target process

3476 2400 WerFault.exe file.exe
3528 1564 WerFault.exe qtcnnjjg.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	file.exe

description	pid	process	target process
PID 1564 set thread context of 220	1564	qtcnnjjg.exe	svchost.exe

pid	process
4332	sc.exe
4660	sc.exe
5044	sc.exe

pid	pid_target	process	target process
3476	2400	WerFault.exe	file.exe
3528	1564	WerFault.exe	qtcnnjjg.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exeqtcnnjjg.exe

description	pid	process	target process
PID 2400 wrote to memory of 4488	2400	file.exe	cmd.exe
PID 2400 wrote to memory of 4488	2400	file.exe	cmd.exe
PID 2400 wrote to memory of 4488	2400	file.exe	cmd.exe
PID 2400 wrote to memory of 4872	2400	file.exe	cmd.exe
PID 2400 wrote to memory of 4872	2400	file.exe	cmd.exe
PID 2400 wrote to memory of 4872	2400	file.exe	cmd.exe
PID 2400 wrote to memory of 4332	2400	file.exe	sc.exe
PID 2400 wrote to memory of 4332	2400	file.exe	sc.exe
PID 2400 wrote to memory of 4332	2400	file.exe	sc.exe
PID 2400 wrote to memory of 4660	2400	file.exe	sc.exe
PID 2400 wrote to memory of 4660	2400	file.exe	sc.exe
PID 2400 wrote to memory of 4660	2400	file.exe	sc.exe
PID 2400 wrote to memory of 5044	2400	file.exe	sc.exe
PID 2400 wrote to memory of 5044	2400	file.exe	sc.exe
PID 2400 wrote to memory of 5044	2400	file.exe	sc.exe
PID 2400 wrote to memory of 4628	2400	file.exe	netsh.exe
PID 2400 wrote to memory of 4628	2400	file.exe	netsh.exe
PID 2400 wrote to memory of 4628	2400	file.exe	netsh.exe
PID 1564 wrote to memory of 220	1564	qtcnnjjg.exe	svchost.exe
PID 1564 wrote to memory of 220	1564	qtcnnjjg.exe	svchost.exe
PID 1564 wrote to memory of 220	1564	qtcnnjjg.exe	svchost.exe
PID 1564 wrote to memory of 220	1564	qtcnnjjg.exe	svchost.exe
PID 1564 wrote to memory of 220	1564	qtcnnjjg.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2400

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kesfnmff\
2⤵
PID:4488

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\qtcnnjjg.exe" C:\Windows\SysWOW64\kesfnmff\
2⤵
PID:4872

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create kesfnmff binPath= "C:\Windows\SysWOW64\kesfnmff\qtcnnjjg.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:4332

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description kesfnmff "wifi internet conection"
2⤵
- Launches sc.exe
PID:4660

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start kesfnmff
2⤵
- Launches sc.exe
PID:5044

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:4628

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2400 -s 1248
2⤵
- Program crash
PID:3476

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2400 -ip 2400
1⤵
PID:4144

C:\Windows\SysWOW64\kesfnmff\qtcnnjjg.exe
C:\Windows\SysWOW64\kesfnmff\qtcnnjjg.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1564

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:220

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1564 -s 552
2⤵
- Program crash
PID:3528

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 1564 -ip 1564
1⤵
PID:3552

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

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\qtcnnjjg.exe
Filesize
12.0MB

MD5
f369527d57bc47898ae64113edb2d1d0

SHA1
8c10f7062cb63b2838d8e3069d21e83198dcb56c

SHA256
2f01d90ce373a99f6c185b5469821dc80e068fe0df39937e8e76f28f19f90352

SHA512
429b15b22ad090f5b2af4ed0c771e7203e38bff7063880ba266e438ff1c21dc6756830b58af044038c007de3d2546dbf860b17f28332fdb052f90c921b49e4e3

Download Submit
C:\Windows\SysWOW64\kesfnmff\qtcnnjjg.exe
Filesize
12.0MB

MD5
f369527d57bc47898ae64113edb2d1d0

SHA1
8c10f7062cb63b2838d8e3069d21e83198dcb56c

SHA256
2f01d90ce373a99f6c185b5469821dc80e068fe0df39937e8e76f28f19f90352

SHA512
429b15b22ad090f5b2af4ed0c771e7203e38bff7063880ba266e438ff1c21dc6756830b58af044038c007de3d2546dbf860b17f28332fdb052f90c921b49e4e3

Download Submit
memory/220-145-0x0000000001100000-0x0000000001115000-memory.dmp

Filesize
84KB

Download
memory/220-150-0x0000000001100000-0x0000000001115000-memory.dmp

Filesize
84KB

Download
memory/220-151-0x0000000001100000-0x0000000001115000-memory.dmp

Filesize
84KB

Download
memory/220-144-0x0000000000000000-mapping.dmp

Download
memory/1564-148-0x0000000000672000-0x0000000000687000-memory.dmp

Filesize
84KB

Download
memory/1564-149-0x0000000000400000-0x000000000045D000-memory.dmp

Filesize
372KB

Download
memory/2400-134-0x0000000000570000-0x0000000000583000-memory.dmp

Filesize
76KB

Download
memory/2400-135-0x0000000000400000-0x000000000045D000-memory.dmp

Filesize
372KB

Download
memory/2400-142-0x0000000000400000-0x000000000045D000-memory.dmp

Filesize
372KB

Download
memory/2400-133-0x00000000007A7000-0x00000000007BC000-memory.dmp

Filesize
84KB

Download
memory/4332-138-0x0000000000000000-mapping.dmp

Download
memory/4488-132-0x0000000000000000-mapping.dmp

Download
memory/4628-141-0x0000000000000000-mapping.dmp

Download
memory/4660-139-0x0000000000000000-mapping.dmp

Download
memory/4872-136-0x0000000000000000-mapping.dmp

Download
memory/5044-140-0x0000000000000000-mapping.dmp

Download

Analysis

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