tofsee | 69124d1b3d101c9199c4d39f766ac185a8a0bd2f191b1295fb2d5780a3b0f38b

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
25/03/2024, 18:41

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General

Target
deb0c884cd5bdf35238e063bc643c2e5.exe
Size 11.7MB
Sample240325-xbt3eafe92
SHA256 69124d1b3d101c9199c4d39f766ac185a8a0bd2f191b1295fb2d5780a3b0f38b
MD5 deb0c884cd5bdf35238e063bc643c2e5
SHA1 79a9bb56636321130ad4a6e031026521a645e195
SHA512 730ac2567491cb39d321a34cabb93db0cabb9bf1f55563facd4092375d3f95fe823540301ec95ba7f6c07cae355fb6062cf8567863b0b28cbfe7af0c510e530b
SSDEEP 49152:m88888888888888888888888888888888888888888888888888888888888888f:
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

defeatwax.ru
refabyd.info

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

pid	Process
2356	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\rftiouo\ImagePath = "C:\\Windows\\SysWOW64\\rftiouo\\umrryqko.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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3270530367-132075249-2153716227-1000\Control Panel\International\Geo\Nation	deb0c884cd5bdf35238e063bc643c2e5.exe

Deletes itself 1 IoCs

pid	Process
3292	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
4892	umrryqko.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4892 set thread context of 3292	4892	umrryqko.exe	108

Launches sc.exe 3 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
3088	sc.exe
1824	sc.exe
3504	sc.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 2 IoCs

pid	pid_target	Process	procid_target
3716	3520	WerFault.exe	88
4468	4892	WerFault.exe	102

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 3520 wrote to memory of 4248	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	92
PID 3520 wrote to memory of 4248	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	92
PID 3520 wrote to memory of 4248	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	92
PID 3520 wrote to memory of 4668	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	94
PID 3520 wrote to memory of 4668	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	94
PID 3520 wrote to memory of 4668	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	94
PID 3520 wrote to memory of 3504	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	96
PID 3520 wrote to memory of 3504	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	96
PID 3520 wrote to memory of 3504	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	96
PID 3520 wrote to memory of 3088	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	98
PID 3520 wrote to memory of 3088	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	98
PID 3520 wrote to memory of 3088	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	98
PID 3520 wrote to memory of 1824	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	100
PID 3520 wrote to memory of 1824	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	100
PID 3520 wrote to memory of 1824	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	100
PID 3520 wrote to memory of 2356	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	103
PID 3520 wrote to memory of 2356	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	103
PID 3520 wrote to memory of 2356	3520	deb0c884cd5bdf35238e063bc643c2e5.exe	103
PID 4892 wrote to memory of 3292	4892	umrryqko.exe	108
PID 4892 wrote to memory of 3292	4892	umrryqko.exe	108
PID 4892 wrote to memory of 3292	4892	umrryqko.exe	108
PID 4892 wrote to memory of 3292	4892	umrryqko.exe	108
PID 4892 wrote to memory of 3292	4892	umrryqko.exe	108

C:\Users\Admin\AppData\Local\Temp\deb0c884cd5bdf35238e063bc643c2e5.exe
"C:\Users\Admin\AppData\Local\Temp\deb0c884cd5bdf35238e063bc643c2e5.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3520
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rftiouo\
  2⤵
  PID:4248
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\umrryqko.exe" C:\Windows\SysWOW64\rftiouo\
  2⤵
  PID:4668
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create rftiouo binPath= "C:\Windows\SysWOW64\rftiouo\umrryqko.exe /d\"C:\Users\Admin\AppData\Local\Temp\deb0c884cd5bdf35238e063bc643c2e5.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:3504
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description rftiouo "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:3088
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start rftiouo
  2⤵
  - Launches sc.exe
  PID:1824
- 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:2356
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3520 -s 1144
  2⤵
  - Program crash
  PID:3716

C:\Windows\SysWOW64\rftiouo\umrryqko.exe
C:\Windows\SysWOW64\rftiouo\umrryqko.exe /d"C:\Users\Admin\AppData\Local\Temp\deb0c884cd5bdf35238e063bc643c2e5.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4892
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:3292
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4892 -s 520
  2⤵
  - Program crash
  PID:4468

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 3520 -ip 3520
1⤵
PID:3660

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4892 -ip 4892
1⤵
PID:2036

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

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Downloads

umrryqko.exe

Path C:\Users\Admin\AppData\Local\Temp\umrryqko.exe
Size 2.9MB
SHA256 2b2d3ad70a25acc6507ef12b6d6840f2b875afd52b471ebc2d7882bf3100b1b6
MD5 2232ee21559e758efa573ea441a22079
SHA1 90facbe9e15c277e6017acf19e16b5741561db6f
SHA512 3d9bba60e4b7e7c34a730cdb2a3b7360377ffe64d9ccdae435eedd42e4e46c09cffcb97ff72f5d2b1bf22bc122cdf22b12a8ae93797b71c2b1e889bea0bb35b2
SSDEEP 49152:k88888888888888888888888888888888888888888888888888888888888888s:v
MD5 SHA1 SHA512 SSDEEP

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umrryqko.exe

Path C:\Windows\SysWOW64\rftiouo\umrryqko.exe
Size 3.0MB
SHA256 a724dc068b93cd5a0015fd57c5ce873c4e636a69f7fc62e34b736c30efcf9e7e
MD5 fb53adeea5e5958b4583bf150b4ea358
SHA1 ccd655df72192627111c7de74ce1616b2322f661
SHA512 7f1a8774780f0c65fe4f1235cf78c936d5a0680527f538db870ae0527c5137c9446bcb51f34e71a3bbe6e930444649baa315d36119ecffffb1a1ddcbbd31e011
SSDEEP 49152:k88888888888888888888888888888888888888888888888888888888888888k:v
MD5 SHA1 SHA512 SSDEEP

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memory/3292-11-0x0000000000E20000-0x0000000000E35000-memory.dmp

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memory/3292-19-0x0000000000E20000-0x0000000000E35000-memory.dmp

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memory/3292-17-0x0000000000E20000-0x0000000000E35000-memory.dmp

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memory/3292-14-0x0000000000E20000-0x0000000000E35000-memory.dmp

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memory/3520-9-0x0000000002CF0000-0x0000000002D03000-memory.dmp

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memory/3520-1-0x0000000002DC0000-0x0000000002EC0000-memory.dmp

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memory/3520-8-0x0000000000400000-0x0000000002C68000-memory.dmp

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memory/3520-4-0x0000000000400000-0x0000000002C68000-memory.dmp

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memory/3520-2-0x0000000002CF0000-0x0000000002D03000-memory.dmp

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memory/4892-10-0x0000000002D70000-0x0000000002E70000-memory.dmp

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memory/4892-15-0x0000000000400000-0x0000000002C68000-memory.dmp

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memory/4892-18-0x0000000000400000-0x0000000002C68000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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