tofsee | e601e2249d2ed99e05552157a32aa73fb476f2b55bb63d10f9a3405d8269c693

General

Target

8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe
Size

232KB
MD5

f6254a206b59207201f38f69fb018932
SHA1

4109d2edf584ce7f8104410eaa02ddae1aa37117
SHA256

8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45
SHA512

bf6ab8ed99b730a364affed3f341387d82a5fed4ae052f4e897726adae2e963182083a3ba6fa52dfa6f2bd9cc9c3b92643279f46bebf931288545938da5a01b6
SSDEEP

3072:aIGGLok59Gt+ECvLFwyvBnlS1g/tK8MJ2LJDhzLrcSb54VIcVTuh:TLoYC+rK+ztK8MY3bIr

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

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
4868	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\ezimypwz\ImagePath = "C:\\Windows\\SysWOW64\\ezimypwz\\icemicib.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-1-5-21-1013461898-3711306144-4198452673-1000\Control Panel\International\Geo\Nation	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe

Executes dropped EXE 1 IoCs

pid	Process
1780	icemicib.exe

Drops file in System32 directory 1 IoCs

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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1780 set thread context of 3324	1780	icemicib.exe	103

Launches sc.exe 3 IoCs

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

pid	Process
112	sc.exe
4264	sc.exe
4580	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
3152	4380	WerFault.exe	84
4320	1780	WerFault.exe	97

Modifies data under HKEY_USERS 2 IoCs

description	ioc	Process
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

description	pid	Process	procid_target
PID 4380 wrote to memory of 4436	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	85
PID 4380 wrote to memory of 4436	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	85
PID 4380 wrote to memory of 4436	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	85
PID 4380 wrote to memory of 4936	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	87
PID 4380 wrote to memory of 4936	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	87
PID 4380 wrote to memory of 4936	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	87
PID 4380 wrote to memory of 4580	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	89
PID 4380 wrote to memory of 4580	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	89
PID 4380 wrote to memory of 4580	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	89
PID 4380 wrote to memory of 112	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	93
PID 4380 wrote to memory of 112	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	93
PID 4380 wrote to memory of 112	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	93
PID 4380 wrote to memory of 4264	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	95
PID 4380 wrote to memory of 4264	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	95
PID 4380 wrote to memory of 4264	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	95
PID 4380 wrote to memory of 4868	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	99
PID 4380 wrote to memory of 4868	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	99
PID 4380 wrote to memory of 4868	4380	8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe	99
PID 1780 wrote to memory of 3324	1780	icemicib.exe	103
PID 1780 wrote to memory of 3324	1780	icemicib.exe	103
PID 1780 wrote to memory of 3324	1780	icemicib.exe	103
PID 1780 wrote to memory of 3324	1780	icemicib.exe	103
PID 1780 wrote to memory of 3324	1780	icemicib.exe	103

C:\Users\Admin\AppData\Local\Temp\8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe
"C:\Users\Admin\AppData\Local\Temp\8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4380
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ezimypwz\
  2⤵
  PID:4436
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\icemicib.exe" C:\Windows\SysWOW64\ezimypwz\
  2⤵
  PID:4936
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create ezimypwz binPath= "C:\Windows\SysWOW64\ezimypwz\icemicib.exe /d\"C:\Users\Admin\AppData\Local\Temp\8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4580
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description ezimypwz "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:112
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start ezimypwz
  2⤵
  - Launches sc.exe
  PID:4264
- 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:4868
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4380 -s 656
  2⤵
  - Program crash
  PID:3152

C:\Windows\SysWOW64\ezimypwz\icemicib.exe
C:\Windows\SysWOW64\ezimypwz\icemicib.exe /d"C:\Users\Admin\AppData\Local\Temp\8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1780
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Drops file in System32 directory
  - Modifies data under HKEY_USERS
  PID:3324
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1780 -s 516
  2⤵
  - Program crash
  PID:4320

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 4380 -ip 4380
1⤵
PID:1064

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 1780 -ip 1780
1⤵
PID:3464

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

New Service

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

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
10.4MB

MD5
f07ae1b88278ff4cf472d4aa1c3ac70e

SHA1
e327744f44eaec52d06132d8411659d173513fe0

SHA256
87c2cd21e6f90fe388553dec8bf65a49ea526deeede7fe496f98f6cc7441c156

SHA512
453d2b22d63a02c93437bccf62d871b47ed89cb383063e7b01baa5b5b8f7b44ffcbd72ae3fd89cede26e9cc64f120dfc0ec386a13e4999d14be51008273c1452

Download Submit
C:\Windows\SysWOW64\ezimypwz\icemicib.exe

Filesize
10.4MB

MD5
f07ae1b88278ff4cf472d4aa1c3ac70e

SHA1
e327744f44eaec52d06132d8411659d173513fe0

SHA256
87c2cd21e6f90fe388553dec8bf65a49ea526deeede7fe496f98f6cc7441c156

SHA512
453d2b22d63a02c93437bccf62d871b47ed89cb383063e7b01baa5b5b8f7b44ffcbd72ae3fd89cede26e9cc64f120dfc0ec386a13e4999d14be51008273c1452

Download Submit
memory/1780-144-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/3324-140-0x0000000000720000-0x0000000000735000-memory.dmp

Filesize
84KB

Download
memory/3324-143-0x0000000000720000-0x0000000000735000-memory.dmp

Filesize
84KB

Download
memory/3324-145-0x0000000000720000-0x0000000000735000-memory.dmp

Filesize
84KB

Download
memory/3324-146-0x0000000000720000-0x0000000000735000-memory.dmp

Filesize
84KB

Download
memory/3324-147-0x0000000000720000-0x0000000000735000-memory.dmp

Filesize
84KB

Download
memory/4380-135-0x0000000002050000-0x0000000002063000-memory.dmp

Filesize
76KB

Download
memory/4380-139-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download

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