tofsee | c38eec9b203dd0fc734fb30ee2280c9df2f970847be0dcda95f4d7c832d739ef

Analysis

max time kernel
160s
max time network
172s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
17-04-2024 14:55

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General

Target

bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe
Size

239KB
MD5

a520a1746783fd618b1f805ce48b313f
SHA1

d66c729c5d5b49c0e02f8f692425a6d4743f58cf
SHA256

bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5
SHA512

04e948f7e1df4856d65e30abfcca3a9ff7417f3e572df32b98d268bd982f87d97fc0a4a955ebe6e75de13d1d0e22132269e4c74124927385010feb00bd34066e
SSDEEP

6144:IfULzEiwjQjbSnDuWi+Ygh5pUTQYJkge:hXEiwjhn4gh5Wtkv

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

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

4220 netsh.exe

pid	process
4220	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\yuxzcliu\ImagePath = "C:\\Windows\\SysWOW64\\yuxzcliu\\vhpmsflj.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:

bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1976 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

vhpmsflj.exe

pid process

3668 vhpmsflj.exe
Drops file in System32 directory 1 IoCs

Processes:

svchost.exe

description ioc process

File created C:\Windows\SysWOW64\config\systemprofile:.repos svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

vhpmsflj.exe

description pid process target process

PID 3668 set thread context of 1976 3668 vhpmsflj.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

4344 sc.exe
3492 sc.exe
4840 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
1976	svchost.exe

pid	process
3668	vhpmsflj.exe

description	ioc	process
File created	C:\Windows\SysWOW64\config\systemprofile:.repos	svchost.exe

description	pid	process	target process
PID 3668 set thread context of 1976	3668	vhpmsflj.exe	svchost.exe

pid	process
4344	sc.exe
3492	sc.exe
4840	sc.exe

Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid	pid_target	process	target process
2892	5104	WerFault.exe	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe
780	3668	WerFault.exe	vhpmsflj.exe

Modifies data under HKEY_USERS 3 IoCs

Processes:

svchost.exe

description	ioc	process
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\MY	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Control Panel\Buses	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Buses\Config0 = 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	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exevhpmsflj.exe

description	pid	process	target process
PID 5104 wrote to memory of 4384	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	cmd.exe
PID 5104 wrote to memory of 4384	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	cmd.exe
PID 5104 wrote to memory of 4384	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	cmd.exe
PID 5104 wrote to memory of 4316	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	cmd.exe
PID 5104 wrote to memory of 4316	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	cmd.exe
PID 5104 wrote to memory of 4316	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	cmd.exe
PID 5104 wrote to memory of 4344	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	sc.exe
PID 5104 wrote to memory of 4344	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	sc.exe
PID 5104 wrote to memory of 4344	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	sc.exe
PID 5104 wrote to memory of 3492	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	sc.exe
PID 5104 wrote to memory of 3492	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	sc.exe
PID 5104 wrote to memory of 3492	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	sc.exe
PID 5104 wrote to memory of 4840	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	sc.exe
PID 5104 wrote to memory of 4840	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	sc.exe
PID 5104 wrote to memory of 4840	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	sc.exe
PID 5104 wrote to memory of 4220	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	netsh.exe
PID 5104 wrote to memory of 4220	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	netsh.exe
PID 5104 wrote to memory of 4220	5104	bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe	netsh.exe
PID 3668 wrote to memory of 1976	3668	vhpmsflj.exe	svchost.exe
PID 3668 wrote to memory of 1976	3668	vhpmsflj.exe	svchost.exe
PID 3668 wrote to memory of 1976	3668	vhpmsflj.exe	svchost.exe
PID 3668 wrote to memory of 1976	3668	vhpmsflj.exe	svchost.exe
PID 3668 wrote to memory of 1976	3668	vhpmsflj.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe
"C:\Users\Admin\AppData\Local\Temp\bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5104
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yuxzcliu\
  2⤵
  PID:4384
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vhpmsflj.exe" C:\Windows\SysWOW64\yuxzcliu\
  2⤵
  PID:4316
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create yuxzcliu binPath= "C:\Windows\SysWOW64\yuxzcliu\vhpmsflj.exe /d\"C:\Users\Admin\AppData\Local\Temp\bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4344
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description yuxzcliu "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:3492
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start yuxzcliu
  2⤵
  - Launches sc.exe
  PID:4840
- 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:4220
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 5104 -s 640
  2⤵
  - Program crash
  PID:2892

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=4048 --field-trial-handle=3060,i,1774866140584649235,8085848018931772189,262144 --variations-seed-version /prefetch:8
1⤵
PID:1984

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 5104 -ip 5104
1⤵
PID:3896

C:\Windows\SysWOW64\yuxzcliu\vhpmsflj.exe
C:\Windows\SysWOW64\yuxzcliu\vhpmsflj.exe /d"C:\Users\Admin\AppData\Local\Temp\bc822ed934731c6843e138a7b5a0f643b6852ee233b0fb861040bd95111d09f5.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3668
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - Drops file in System32 directory
  - Modifies data under HKEY_USERS
  PID:1976
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3668 -s 532
  2⤵
  - Program crash
  PID:780

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 3668 -ip 3668
1⤵
PID:3440

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Defense Evasion

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\vhpmsflj.exe

Filesize
13.9MB

MD5
1269d2e36dff38e65ad46151622dc8a4

SHA1
29d66279ce0964fef9805132f218bd8c7ddf4ae9

SHA256
18ae6305509b9ca1ada1ae0c4bbd1f5dbe0643191895d799b077b550064030fd

SHA512
b41647742bbe88af785d73720fcd9d4575a95715e690dab516bbb00e10ad6be9dcbc42dd82ab8f979bf810eb59efaf408c42d95c1de65321a11ab93b7061e430

Download Submit
memory/1976-56-0x00000000027E0000-0x00000000027E5000-memory.dmp

Filesize
20KB

Download
memory/1976-54-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-42-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-64-0x00000000027F0000-0x00000000027F7000-memory.dmp

Filesize
28KB

Download
memory/1976-63-0x0000000007240000-0x000000000764B000-memory.dmp

Filesize
4.0MB

Download
memory/1976-39-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-43-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-41-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-44-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-45-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-47-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-20-0x0000000000680000-0x0000000000695000-memory.dmp

Filesize
84KB

Download
memory/1976-40-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-48-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-26-0x0000000000680000-0x0000000000695000-memory.dmp

Filesize
84KB

Download
memory/1976-28-0x0000000000680000-0x0000000000695000-memory.dmp

Filesize
84KB

Download
memory/1976-29-0x0000000002200000-0x000000000240F000-memory.dmp

Filesize
2.1MB

Download
memory/1976-32-0x0000000002200000-0x000000000240F000-memory.dmp

Filesize
2.1MB

Download
memory/1976-33-0x00000000019F0000-0x00000000019F6000-memory.dmp

Filesize
24KB

Download
memory/1976-36-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-25-0x0000000000680000-0x0000000000695000-memory.dmp

Filesize
84KB

Download
memory/1976-51-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-53-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-46-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-49-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-50-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-52-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/1976-59-0x00000000027E0000-0x00000000027E5000-memory.dmp

Filesize
20KB

Download
memory/1976-60-0x0000000007240000-0x000000000764B000-memory.dmp

Filesize
4.0MB

Download
memory/1976-55-0x0000000002550000-0x0000000002560000-memory.dmp

Filesize
64KB

Download
memory/3668-23-0x0000000000400000-0x000000000085D000-memory.dmp

Filesize
4.4MB

Download
memory/3668-19-0x0000000000400000-0x000000000085D000-memory.dmp

Filesize
4.4MB

Download
memory/3668-18-0x0000000000A20000-0x0000000000B20000-memory.dmp

Filesize
1024KB

Download
memory/5104-1-0x0000000000AF0000-0x0000000000BF0000-memory.dmp

Filesize
1024KB

Download
memory/5104-3-0x0000000000400000-0x000000000085D000-memory.dmp

Filesize
4.4MB

Download
memory/5104-4-0x0000000000400000-0x000000000085D000-memory.dmp

Filesize
4.4MB

Download
memory/5104-2-0x00000000025B0000-0x00000000025C3000-memory.dmp

Filesize
76KB

Download
memory/5104-17-0x0000000000400000-0x000000000085D000-memory.dmp

Filesize
4.4MB

Download
memory/5104-9-0x00000000025B0000-0x00000000025C3000-memory.dmp

Filesize
76KB

Download
memory/5104-8-0x0000000000400000-0x000000000085D000-memory.dmp

Filesize
4.4MB

Download
memory/5104-7-0x0000000000AF0000-0x0000000000BF0000-memory.dmp

Filesize
1024KB

Download
memory/5104-5-0x0000000000400000-0x000000000085D000-memory.dmp

Filesize
4.4MB

Download