stormser | c1a108c2f0381c59728a7ae94d0d2d807a820b3d3fd482ba9c35175494b1873f

General

Target
2026-08-16_275eb3bbcf1e1ea4829be5cddd8c2bb8_elex_remcos_wannacry.exe
Size 59KB
Sample260816-flcsfa1tbv
SHA256 c1a108c2f0381c59728a7ae94d0d2d807a820b3d3fd482ba9c35175494b1873f
MD5 275eb3bbcf1e1ea4829be5cddd8c2bb8
SHA1 9ed79b8beffccea144dd75a689729ee8ab881b9c
SHA512 5cdd0b74688ebe6f6d047ef361ff7306439c8064ad6a08044e7340e35be85aadeec245ded18488fcd1f1cb67e6c6f7caa4bfebfbc7a0fd0c1f9c15043b6331cf
SSDEEP 384:MbLwOs8AHsc4sMfwhKQLroK4/CFsrdHWMZ:Mvw9816vhKQLroK4/wQpWMZ
TLSH
T19A434B830F997CF2FB810175043A8BB992AB59D4D14FFE9BBF90CC194436651E83E60A
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/0x00080000000242c0-2.dat	family_stormser
behavioral1/files/0x000300000001e695-6.dat	family_stormser

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

resource	yara_rule
behavioral1/files/0x00080000000242c0-2.dat	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/files/0x000300000001e695-6.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\{B2606AC8-8650-4f72-B6C4-BEB599B54043}	2026-08-16_275eb3bbcf1e1ea4829be5cddd8c2bb8_elex_remcos_wannacry.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{B2606AC8-8650-4f72-B6C4-BEB599B54043}\stubpath = "C:\\Windows\\{B2606AC8-8650-4f72-B6C4-BEB599B54043}.exe"	2026-08-16_275eb3bbcf1e1ea4829be5cddd8c2bb8_elex_remcos_wannacry.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{0C8EBF7B-9603-41d3-BC33-B1F8C1BA9024}	{B2606AC8-8650-4f72-B6C4-BEB599B54043}.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{0C8EBF7B-9603-41d3-BC33-B1F8C1BA9024}\stubpath = "C:\\Windows\\{0C8EBF7B-9603-41d3-BC33-B1F8C1BA9024}.exe"	{B2606AC8-8650-4f72-B6C4-BEB599B54043}.exe

Executes dropped EXE 2 IoCs

pid	Process
2852	{B2606AC8-8650-4f72-B6C4-BEB599B54043}.exe
852	{0C8EBF7B-9603-41d3-BC33-B1F8C1BA9024}.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\{B2606AC8-8650-4f72-B6C4-BEB599B54043}.exe	2026-08-16_275eb3bbcf1e1ea4829be5cddd8c2bb8_elex_remcos_wannacry.exe
File created	C:\Windows\{0C8EBF7B-9603-41d3-BC33-B1F8C1BA9024}.exe	{B2606AC8-8650-4f72-B6C4-BEB599B54043}.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
4072	cmd.exe
2012	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	2026-08-16_275eb3bbcf1e1ea4829be5cddd8c2bb8_elex_remcos_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	{B2606AC8-8650-4f72-B6C4-BEB599B54043}.exe
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	{0C8EBF7B-9603-41d3-BC33-B1F8C1BA9024}.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeIncBasePriorityPrivilege	2760	2026-08-16_275eb3bbcf1e1ea4829be5cddd8c2bb8_elex_remcos_wannacry.exe
Token: SeIncBasePriorityPrivilege	2852	{B2606AC8-8650-4f72-B6C4-BEB599B54043}.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2760 wrote to memory of 2852	2760	2026-08-16_275eb3bbcf1e1ea4829be5cddd8c2bb8_elex_remcos_wannacry.exe	90
PID 2760 wrote to memory of 4072	2760	2026-08-16_275eb3bbcf1e1ea4829be5cddd8c2bb8_elex_remcos_wannacry.exe	91
PID 2852 wrote to memory of 852	2852	{B2606AC8-8650-4f72-B6C4-BEB599B54043}.exe	93
PID 2852 wrote to memory of 2012	2852	{B2606AC8-8650-4f72-B6C4-BEB599B54043}.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-16_275eb3bbcf1e1ea4829be5cddd8c2bb8_elex_remcos_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-16_275eb3bbcf1e1ea4829be5cddd8c2bb8_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:2760
- C:\Windows\{B2606AC8-8650-4f72-B6C4-BEB599B54043}.exe
  C:\Windows\{B2606AC8-8650-4f72-B6C4-BEB599B54043}.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:2852
- - C:\Windows\{0C8EBF7B-9603-41d3-BC33-B1F8C1BA9024}.exe
    C:\Windows\{0C8EBF7B-9603-41d3-BC33-B1F8C1BA9024}.exe
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:852
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c del C:\Windows\{B2606~1.EXE > nul
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    PID:2012
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c del C:\Users\Admin\AppData\Local\Temp\2026-0~1.EXE > nul
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:4072

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

{0C8EBF7B-9603-41d3-BC33-B1F8C1BA9024}.exe

Path C:\Windows\{0C8EBF7B-9603-41d3-BC33-B1F8C1BA9024}.exe
Size 59KB
SHA256 6cd323994c04ecd12d670283e7acd434696710d1fc4dfd2d7d128c8ab9555e00
MD5 86724be3a929d1d63b73db92513279c7
SHA1 f27a12ea1459e9950fd5e6ddf7493e2d8faa4ce8
SHA512 54f03f63553f8ec8611b63d1cb93eceaff7c43190693505ae07a12ab0b57f2cfb852eb8f9b66cf24a9378919b67804e139942c798666dd2bcd43ea9cf2d5b4d4
SSDEEP 384:MbLwOs8AHsc4sMfwhKQLroo4/CFsrdHWMZ:Mvw9816vhKQLroo4/wQpWMZ
TLSH
T144433B830F997CF2FB810175047A8BB992AB59D4D14FFE9BBF90CC194436651E83E60A
MD5 SHA1 SHA512 SSDEEP TLSH

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{B2606AC8-8650-4f72-B6C4-BEB599B54043}.exe

Path C:\Windows\{B2606AC8-8650-4f72-B6C4-BEB599B54043}.exe
Size 59KB
SHA256 dd8eb198b7f68844627240d5bad8d7e4b4393da26085b322097c810c5dc139f5
MD5 9a2eaaaa03628a4b0ae5a5d87175c6cc
SHA1 55c595854eb71a36ba4db4cf01abe6fb1bb765cc
SHA512 0331384c01807aaa158111b6d554d4d59b6dbb3a1bda55f318608e5d994d6281efa5ac61519ab35fa1a975a96e1d052d40f70a92b67d7ca7d43fa2d0b43a911f
SSDEEP 384:MbLwOs8AHsc4sMfwhKQLroM4/CFsrdHWMZ:Mvw9816vhKQLroM4/wQpWMZ
TLSH
T1DE433B830F997CF2FB810175043A8B7992AB59D4D14FFE9BBF90CC194436691E83E60A
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