tofsee | e8493767ef4c9ef760027ecd5700839392714513b37653681be91ef1b60d6cb2

General

Target

ccc0fda39468b0b05708c2a70b8f6da7.exe
Size

13.1MB
MD5

ccc0fda39468b0b05708c2a70b8f6da7
SHA1

40d22b54f2efa41a802c9f2d5cf115742f10b061
SHA256

e8493767ef4c9ef760027ecd5700839392714513b37653681be91ef1b60d6cb2
SHA512

125e2bf982335f67841d0bb3010b07bfbec52116e0ae6e66414906dcb6d0e142157dfcb8ed97124e1ab10121ae697606f043497ce0cc9c3b14ff87df6e757fc6
SSDEEP

49152:iWYi3SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSv:iW

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

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
2476	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\dbvwntox\ImagePath = "C:\\Windows\\SysWOW64\\dbvwntox\\fkgywzl.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-1-5-21-983155329-280873152-1838004294-1000\Control Panel\International\Geo\Nation	ccc0fda39468b0b05708c2a70b8f6da7.exe

Deletes itself 1 IoCs

pid	Process
3084	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2844	fkgywzl.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2844 set thread context of 3084	2844	fkgywzl.exe	114

Launches sc.exe 3 IoCs

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

pid	Process
3920	sc.exe
1544	sc.exe
4504	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
4108	1392	WerFault.exe	86
3624	2844	WerFault.exe	105

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1392 wrote to memory of 3964	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	95
PID 1392 wrote to memory of 3964	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	95
PID 1392 wrote to memory of 3964	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	95
PID 1392 wrote to memory of 4004	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	97
PID 1392 wrote to memory of 4004	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	97
PID 1392 wrote to memory of 4004	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	97
PID 1392 wrote to memory of 3920	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	99
PID 1392 wrote to memory of 3920	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	99
PID 1392 wrote to memory of 3920	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	99
PID 1392 wrote to memory of 1544	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	101
PID 1392 wrote to memory of 1544	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	101
PID 1392 wrote to memory of 1544	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	101
PID 1392 wrote to memory of 4504	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	103
PID 1392 wrote to memory of 4504	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	103
PID 1392 wrote to memory of 4504	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	103
PID 1392 wrote to memory of 2476	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	107
PID 1392 wrote to memory of 2476	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	107
PID 1392 wrote to memory of 2476	1392	ccc0fda39468b0b05708c2a70b8f6da7.exe	107
PID 2844 wrote to memory of 3084	2844	fkgywzl.exe	114
PID 2844 wrote to memory of 3084	2844	fkgywzl.exe	114
PID 2844 wrote to memory of 3084	2844	fkgywzl.exe	114
PID 2844 wrote to memory of 3084	2844	fkgywzl.exe	114
PID 2844 wrote to memory of 3084	2844	fkgywzl.exe	114

C:\Users\Admin\AppData\Local\Temp\ccc0fda39468b0b05708c2a70b8f6da7.exe
"C:\Users\Admin\AppData\Local\Temp\ccc0fda39468b0b05708c2a70b8f6da7.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1392
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dbvwntox\
  2⤵
  PID:3964
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fkgywzl.exe" C:\Windows\SysWOW64\dbvwntox\
  2⤵
  PID:4004
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create dbvwntox binPath= "C:\Windows\SysWOW64\dbvwntox\fkgywzl.exe /d\"C:\Users\Admin\AppData\Local\Temp\ccc0fda39468b0b05708c2a70b8f6da7.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:3920
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description dbvwntox "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1544
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start dbvwntox
  2⤵
  - Launches sc.exe
  PID:4504
- 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:2476
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1392 -s 1184
  2⤵
  - Program crash
  PID:4108

C:\Windows\SysWOW64\dbvwntox\fkgywzl.exe
C:\Windows\SysWOW64\dbvwntox\fkgywzl.exe /d"C:\Users\Admin\AppData\Local\Temp\ccc0fda39468b0b05708c2a70b8f6da7.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2844
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:3084
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2844 -s 508
  2⤵
  - Program crash
  PID:3624

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 1392 -ip 1392
1⤵
PID:2520

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 2844 -ip 2844
1⤵
PID:1876

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Defense Evasion

Impair Defenses

1

T1562

Disable or Modify System Firewall

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
13.3MB

MD5
6b67234483fa6ebf5519e6704a8ee762

SHA1
73022d00d17d7f528a105e7bbdbfe1ecb3237501

SHA256
1f526de86ed0b565874fd6672cc3f7c75d5c661efa440fd8dc9f564ab026914a

SHA512
811bce93f55526ccc91c8c9df02f3aada1cfea1bb6fdc082cf9d558520ca6fb04f9ef7003c1ba540296ffc9a6557f936822fd6f6c7eeba8d21178090f6a3d720

Download Submit
C:\Windows\SysWOW64\dbvwntox\fkgywzl.exe

Filesize
3.1MB

MD5
80092696914e5893c03d100abda2f9fe

SHA1
1b7101b43d2dafa1f7df32ca2679d501cf5dfb4a

SHA256
456aab8790d1e21d3c03f64d6fad058d327ae242df7da41bbee2cf6abec32ac9

SHA512
a8e002dd48584008276bf4e89b5854a26ec25ccd320e58f11892602eca227a34d34783d422510395260cd7607f3cc7e720b4f52d069b8a4783d4b4e3c66bbd6e

Download Submit
memory/1392-9-0x0000000004A00000-0x0000000004A13000-memory.dmp

Filesize
76KB

Download
memory/1392-4-0x0000000000400000-0x0000000002CC0000-memory.dmp

Filesize
40.8MB

Download
memory/1392-2-0x0000000004A00000-0x0000000004A13000-memory.dmp

Filesize
76KB

Download
memory/1392-8-0x0000000000400000-0x0000000002CC0000-memory.dmp

Filesize
40.8MB

Download
memory/1392-1-0x0000000002CE0000-0x0000000002DE0000-memory.dmp

Filesize
1024KB

Download
memory/2844-10-0x0000000002CE0000-0x0000000002DE0000-memory.dmp

Filesize
1024KB

Download
memory/2844-16-0x0000000000400000-0x0000000002CC0000-memory.dmp

Filesize
40.8MB

Download
memory/3084-11-0x0000000000D40000-0x0000000000D55000-memory.dmp

Filesize
84KB

Download
memory/3084-14-0x0000000000D40000-0x0000000000D55000-memory.dmp

Filesize
84KB

Download
memory/3084-17-0x0000000000D40000-0x0000000000D55000-memory.dmp

Filesize
84KB

Download
memory/3084-18-0x0000000000D40000-0x0000000000D55000-memory.dmp

Filesize
84KB

Download
memory/3084-19-0x0000000000D40000-0x0000000000D55000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads