stormser | 130461da33b72835ef97aa958674f5e0d46fddc021122bf5150ec2a9a7107415

General

Target
2026-10-16_e4cf35b2ec4ea831e5d9f910c644c360_elex_remcos_wannacry.exe
Size 60KB
Sample261017-e2f95asv7j
SHA256 130461da33b72835ef97aa958674f5e0d46fddc021122bf5150ec2a9a7107415
MD5 e4cf35b2ec4ea831e5d9f910c644c360
SHA1 bdd59790e42328f4ba66238f66f77f69a7878069
SHA512 a2abc19fab60c2ce275e2ace31e11fd4a24df4de7a509aa20a758706f04539223409c92ab653e369146402a2afed052318dbcf490fbd1341d7cc3a304439f402
SSDEEP 384:vbLwOs8AHsc4sMfwhKQLroy4/CFsrdHWMZo:vvw9816vhKQLroy4/wQpWMZo
TLSH
T1D0533B830F9978F2FB810175047A8B79926B59D4D14FFE9BBF90CC194436651E83E60A
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution stormser persistence worm

Malware Config

Signatures

Family: Stormser, StormDDoS, StormAttack, Stormer
Stormser aka StormDDoS, StormAttack, and Stormer is a Windows worm written in C++.
worm stormser

Detects Stormser aka Storm DDoS and StormAttack 2 IoCs

resource	yara_rule
behavioral1/files/0x0007000000024435-2.dat	family_stormser
behavioral1/files/0x0008000000024427-5.dat	family_stormser

Detects Windows executables referencing non-Windows User-Agents 2 IoCs

resource	yara_rule
behavioral1/files/0x0007000000024435-2.dat	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/files/0x0008000000024427-5.dat	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Boot or Logon Autostart Execution: Active Setup 2 TTPs 4 IoCs

Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

persistence

Active Setup

T1547.014

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{55BFDF81-DFD4-44e1-8FB3-4914D920DB30}	2026-10-16_e4cf35b2ec4ea831e5d9f910c644c360_elex_remcos_wannacry.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{55BFDF81-DFD4-44e1-8FB3-4914D920DB30}\stubpath = "C:\\Windows\\{55BFDF81-DFD4-44e1-8FB3-4914D920DB30}.exe"	2026-10-16_e4cf35b2ec4ea831e5d9f910c644c360_elex_remcos_wannacry.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{E5EA6CF2-6DD6-4304-B588-24BA3035F5E8}	{55BFDF81-DFD4-44e1-8FB3-4914D920DB30}.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{E5EA6CF2-6DD6-4304-B588-24BA3035F5E8}\stubpath = "C:\\Windows\\{E5EA6CF2-6DD6-4304-B588-24BA3035F5E8}.exe"	{55BFDF81-DFD4-44e1-8FB3-4914D920DB30}.exe

Executes dropped EXE 2 IoCs

pid	Process
2404	{55BFDF81-DFD4-44e1-8FB3-4914D920DB30}.exe
1020	{E5EA6CF2-6DD6-4304-B588-24BA3035F5E8}.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\{55BFDF81-DFD4-44e1-8FB3-4914D920DB30}.exe	2026-10-16_e4cf35b2ec4ea831e5d9f910c644c360_elex_remcos_wannacry.exe
File created	C:\Windows\{E5EA6CF2-6DD6-4304-B588-24BA3035F5E8}.exe	{55BFDF81-DFD4-44e1-8FB3-4914D920DB30}.exe

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
216	cmd.exe
3408	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-16_e4cf35b2ec4ea831e5d9f910c644c360_elex_remcos_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	{55BFDF81-DFD4-44e1-8FB3-4914D920DB30}.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	{E5EA6CF2-6DD6-4304-B588-24BA3035F5E8}.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeIncBasePriorityPrivilege	3752	2026-10-16_e4cf35b2ec4ea831e5d9f910c644c360_elex_remcos_wannacry.exe
Token: SeIncBasePriorityPrivilege	2404	{55BFDF81-DFD4-44e1-8FB3-4914D920DB30}.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3752 wrote to memory of 2404	3752	2026-10-16_e4cf35b2ec4ea831e5d9f910c644c360_elex_remcos_wannacry.exe	97
PID 3752 wrote to memory of 216	3752	2026-10-16_e4cf35b2ec4ea831e5d9f910c644c360_elex_remcos_wannacry.exe	98
PID 2404 wrote to memory of 1020	2404	{55BFDF81-DFD4-44e1-8FB3-4914D920DB30}.exe	99
PID 2404 wrote to memory of 3408	2404	{55BFDF81-DFD4-44e1-8FB3-4914D920DB30}.exe	100

C:\Users\Admin\AppData\Local\Temp\2026-10-16_e4cf35b2ec4ea831e5d9f910c644c360_elex_remcos_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-16_e4cf35b2ec4ea831e5d9f910c644c360_elex_remcos_wannacry.exe"
1⤵
- Boot or Logon Autostart Execution: Active Setup
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3752
- C:\Windows\{55BFDF81-DFD4-44e1-8FB3-4914D920DB30}.exe
  C:\Windows\{55BFDF81-DFD4-44e1-8FB3-4914D920DB30}.exe
  2⤵
  - Boot or Logon Autostart Execution: Active Setup
  - Executes dropped EXE
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2404
- - C:\Windows\{E5EA6CF2-6DD6-4304-B588-24BA3035F5E8}.exe
    C:\Windows\{E5EA6CF2-6DD6-4304-B588-24BA3035F5E8}.exe
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1020
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c del C:\Windows\{55BFD~1.EXE > nul
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    PID:3408
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c del C:\Users\Admin\AppData\Local\Temp\2026-1~1.EXE > nul
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:216

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Persistence

Boot or Logon Autostart Execution

1

T1547

Active Setup

1

T1547.014

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Active Setup

1

T1547.014

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

{55BFDF81-DFD4-44e1-8FB3-4914D920DB30}.exe

Path C:\Windows\{55BFDF81-DFD4-44e1-8FB3-4914D920DB30}.exe
Size 60KB
SHA256 af9f4d3729fd26f715cb8511bdaeaab703e58549b2c06411d49ab919177140ee
MD5 a5fed8dc1ad48ba54bad3f65977788ef
SHA1 e16ae8eaf28284b62fd0f6bf967d494aa9ee7ab0
SHA512 f0e263ac16398ec9f079050e1a49b377b4c12ef81260e165a33988788d1c3dc79af5c5a11a9dede10dacab1a2609e9be10f045b68f328204315e918652f79a92
SSDEEP 384:vbLwOs8AHsc4sMfwhKQLroPl4/CFsrdHWMZo:vvw9816vhKQLroPl4/wQpWMZo
TLSH
T1E0534A830F997CF2FB810175043A8BB992AB59D4D14FFE9BBF90CC194436651E83E60A
MD5 SHA1 SHA512 SSDEEP TLSH

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{E5EA6CF2-6DD6-4304-B588-24BA3035F5E8}.exe

Path C:\Windows\{E5EA6CF2-6DD6-4304-B588-24BA3035F5E8}.exe
Size 60KB
SHA256 b4fd257adcd432dc330d75007e21e8aad110910b359ddf5a36014255e099e9d3
MD5 e24016bf6e7a8b035222ae42f4f2a221
SHA1 f70e08793bfba7d8a32c0fb5ed69480865f1c61d
SHA512 58a31f9920dac65c967767e35c0b7d6aa7cdb19d91138631ec9a3b46e8ab4115ba550a50facec86dfa701ec0a14dc9318f9938b5e2db113cbf93b2a77268560b
SSDEEP 384:vbLwOs8AHsc4sMfwhKQLroc4/CFsrdHWMZo:vvw9816vhKQLroc4/wQpWMZo
TLSH
T111533B830F997CF2FB810175047A8B7992AB59D4D14FFE9BBF90CC194436691E83E60A
MD5 SHA1 SHA512 SSDEEP TLSH

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads