stormser | 35ff415768e098dac27d25c08cf6b86191e80963d6f07e9d5a2df21c5d5bfe13

General

Target
2026-10-30_acc9d052b6b4be56626c7cf79cbbf5b8_elex_remcos_wannacry.exe
Size 60KB
Sample261030-yk52psey2w
SHA256 35ff415768e098dac27d25c08cf6b86191e80963d6f07e9d5a2df21c5d5bfe13
MD5 acc9d052b6b4be56626c7cf79cbbf5b8
SHA1 8c416c61ac6831a2a68147aa261fce54304d232c
SHA512 6df5479578c26dbbe31f90941936d0ead37243e8dcf9d32a59ec91d08c9b0131258dacc1217d0219e81311f064c68f3100cb3ab389d253c361c6f728fee2feec
SSDEEP 384:vbLwOs8AHsc4sMfwhKQLroj4/CFsrdHWMZo:vvw9816vhKQLroj4/wQpWMZo
TLSH
T14D533B830F997CF2FB810175047A8B7992AB59D4D14FFE9BBF90CC194436691E83E60A
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/0x0007000000024511-2.dat	family_stormser
behavioral1/files/0x0008000000024502-6.dat	family_stormser

Custom signature

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

resource	yara_rule
behavioral1/files/0x0007000000024511-2.dat	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/files/0x0008000000024502-6.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\{7A665D53-A78C-4f0a-A9EE-5EEDDDB458B5}	2026-10-30_acc9d052b6b4be56626c7cf79cbbf5b8_elex_remcos_wannacry.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{7A665D53-A78C-4f0a-A9EE-5EEDDDB458B5}\stubpath = "C:\\Windows\\{7A665D53-A78C-4f0a-A9EE-5EEDDDB458B5}.exe"	2026-10-30_acc9d052b6b4be56626c7cf79cbbf5b8_elex_remcos_wannacry.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{F5C29038-FEAD-4ff8-B402-882A91162AC7}	{7A665D53-A78C-4f0a-A9EE-5EEDDDB458B5}.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{F5C29038-FEAD-4ff8-B402-882A91162AC7}\stubpath = "C:\\Windows\\{F5C29038-FEAD-4ff8-B402-882A91162AC7}.exe"	{7A665D53-A78C-4f0a-A9EE-5EEDDDB458B5}.exe

Executes dropped EXE 2 IoCs

pid	Process
864	{7A665D53-A78C-4f0a-A9EE-5EEDDDB458B5}.exe
2836	{F5C29038-FEAD-4ff8-B402-882A91162AC7}.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\{7A665D53-A78C-4f0a-A9EE-5EEDDDB458B5}.exe	2026-10-30_acc9d052b6b4be56626c7cf79cbbf5b8_elex_remcos_wannacry.exe
File created	C:\Windows\{F5C29038-FEAD-4ff8-B402-882A91162AC7}.exe	{7A665D53-A78C-4f0a-A9EE-5EEDDDB458B5}.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
4152	cmd.exe
5540	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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	{F5C29038-FEAD-4ff8-B402-882A91162AC7}.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-30_acc9d052b6b4be56626c7cf79cbbf5b8_elex_remcos_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	{7A665D53-A78C-4f0a-A9EE-5EEDDDB458B5}.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeIncBasePriorityPrivilege	4868	2026-10-30_acc9d052b6b4be56626c7cf79cbbf5b8_elex_remcos_wannacry.exe
Token: SeIncBasePriorityPrivilege	864	{7A665D53-A78C-4f0a-A9EE-5EEDDDB458B5}.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4868 wrote to memory of 864	4868	2026-10-30_acc9d052b6b4be56626c7cf79cbbf5b8_elex_remcos_wannacry.exe	93
PID 4868 wrote to memory of 4152	4868	2026-10-30_acc9d052b6b4be56626c7cf79cbbf5b8_elex_remcos_wannacry.exe	94
PID 864 wrote to memory of 2836	864	{7A665D53-A78C-4f0a-A9EE-5EEDDDB458B5}.exe	95
PID 864 wrote to memory of 5540	864	{7A665D53-A78C-4f0a-A9EE-5EEDDDB458B5}.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-30_acc9d052b6b4be56626c7cf79cbbf5b8_elex_remcos_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-30_acc9d052b6b4be56626c7cf79cbbf5b8_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:4868
- C:\Windows\{7A665D53-A78C-4f0a-A9EE-5EEDDDB458B5}.exe
  C:\Windows\{7A665D53-A78C-4f0a-A9EE-5EEDDDB458B5}.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:864
- - C:\Windows\{F5C29038-FEAD-4ff8-B402-882A91162AC7}.exe
    C:\Windows\{F5C29038-FEAD-4ff8-B402-882A91162AC7}.exe
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:2836
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c del C:\Windows\{7A665~1.EXE > nul
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    PID:5540
- 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:4152

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

{7A665D53-A78C-4f0a-A9EE-5EEDDDB458B5}.exe

Path C:\Windows\{7A665D53-A78C-4f0a-A9EE-5EEDDDB458B5}.exe
Size 60KB
SHA256 76a0d8c678a10d46d7de2ec3eb8a879bef68c9cd1ec1a8871978e41524207384
MD5 c074b7e5f4c2cb9b97788966a3880bc4
SHA1 8fe66d462f6698f9bc7c5409ad3188995a154f1a
SHA512 ad310e791afe1d53db2f89b28e85a39a3b319132ef758cc4f89b4fb2a3e1e3e3afd96b981674dd0af95cd72b7d69375beb30c26746e71427374479c26eb6b6d7
SSDEEP 384:vbLwOs8AHsc4sMfwhKQLrox4/CFsrdHWMZo:vvw9816vhKQLrox4/wQpWMZo
TLSH
T143533B830F997CF2FB810175043A8B7992AB59D4D14FFE9BBF90CC194436691E83E60A
MD5 SHA1 SHA512 SSDEEP TLSH

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{F5C29038-FEAD-4ff8-B402-882A91162AC7}.exe

Path C:\Windows\{F5C29038-FEAD-4ff8-B402-882A91162AC7}.exe
Size 60KB
SHA256 649ab5cdda98527160dc6f27d98e25716370d7b965ae2e8a7921b7af49525f66
MD5 6b66223eec884bf3d7f2d664c3b628fb
SHA1 51e535d0284fced8d39441e11726a431d41b9b2d
SHA512 6fbd03b411753a227063e12e54cbc356b2d5b103f4304b81f0f18557ce8d7046bfd736bc466b9d6b57b8fc642557bbfc96cc0dc78b245cb1956fe2f32fa4be51
SSDEEP 384:vbLwOs8AHsc4sMfwhKQLrow4/CFsrdHWMZo:vvw9816vhKQLrow4/wQpWMZo
TLSH
T18F533A830F997CF2FB810175047A8BB992AB59D4D14FFE9BBF90CC194436651E83E60A
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