warmcookie | c437e5caa4f644024014d40e62a5436c59046efc76c666ea3f83ab61df615314

Analysis

max time kernel
299s
max time network
305s
platform
windows7_x64
resource
win7-20240419-en
resource tags

arch:x64arch:x86image:win7-20240419-enlocale:en-usos:windows7-x64system
submitted
01/07/2024, 07:02

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

c437e5caa4f644024014d40e62a5436c59046efc76c666ea3f83ab61df615314.dll
Size

141KB
MD5

5fa10a64b7e1cfc3d8b8d45cefb6f837
SHA1

5f69a841cd4533ba671c1e6f73bd3b65d903f272
SHA256

c437e5caa4f644024014d40e62a5436c59046efc76c666ea3f83ab61df615314
SHA512

98f49ed14fe9fb14c6f0147ff53bb00969be5576f3e8a25ed1b35639390fbb7e88c440a51d451df644e72d2595ebe9748af01230b22400bd5b42ec87685b1306
SSDEEP

3072:HACxLpcTIhjZM3VhHSkYl8CagwurZvE9vV1ZQcR:HTtpcPlJSTl4PuG

Score

10^/10

warmcookie backdoor discovery

Malware Config

Extracted

Family

warmcookie

185.49.69.41

Attributes

mutex
5628919c-ac3f-4c57-89c9-7c71740b3c8e
user_agent
Mozilla / 4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;.NET CLR 1.0.3705)

Signatures

Warmcookie
Warmcookie is a backdoor written in C++.
backdoor warmcookie

Blocklisted process makes network request 64 IoCs

flow	pid	Process
4	2488	rundll32.exe
5	2488	rundll32.exe
6	2488	rundll32.exe
7	2488	rundll32.exe
8	2488	rundll32.exe
9	2488	rundll32.exe
13	2488	rundll32.exe
14	2488	rundll32.exe
15	2488	rundll32.exe
16	2488	rundll32.exe
17	2488	rundll32.exe
18	2488	rundll32.exe
20	2488	rundll32.exe
21	2488	rundll32.exe
22	2488	rundll32.exe
23	2488	rundll32.exe
24	2488	rundll32.exe
25	2488	rundll32.exe
27	2488	rundll32.exe
28	2488	rundll32.exe
29	2488	rundll32.exe
30	2488	rundll32.exe
31	2488	rundll32.exe
32	2488	rundll32.exe
34	2488	rundll32.exe
35	2488	rundll32.exe
36	2488	rundll32.exe
37	2488	rundll32.exe
38	2488	rundll32.exe
39	2488	rundll32.exe
41	2488	rundll32.exe
42	2488	rundll32.exe
43	2488	rundll32.exe
44	2488	rundll32.exe
45	2488	rundll32.exe
46	2488	rundll32.exe
48	2488	rundll32.exe
49	2488	rundll32.exe
50	2488	rundll32.exe
51	2488	rundll32.exe
52	2488	rundll32.exe
53	2488	rundll32.exe
55	2488	rundll32.exe
56	2488	rundll32.exe
57	2488	rundll32.exe
58	2488	rundll32.exe
59	2488	rundll32.exe
60	2488	rundll32.exe
62	2488	rundll32.exe
63	2488	rundll32.exe
64	2488	rundll32.exe
65	2488	rundll32.exe
66	2488	rundll32.exe
67	2488	rundll32.exe
69	2488	rundll32.exe
70	2488	rundll32.exe
71	2488	rundll32.exe
72	2488	rundll32.exe
73	2488	rundll32.exe
74	2488	rundll32.exe
76	2488	rundll32.exe
77	2488	rundll32.exe
78	2488	rundll32.exe
79	2488	rundll32.exe

Loads dropped DLL 4 IoCs

pid	Process
2488	rundll32.exe
2488	rundll32.exe
2488	rundll32.exe
2488	rundll32.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\Windows\Temporary Internet Files\counters.dat	rundll32.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File created	C:\Windows\Tasks\RtlUpd.job	regsvr32.exe

Modifies data under HKEY_USERS 52 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings = 4600000005000000090000000000000000000000000000000400000000000000000000000000000000000000000000000000000001000000020000000a7f00d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings = 460000000b000000090000000000000000000000000000000400000000000000000000000000000000000000000000000000000001000000020000000a7f00d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings = 4600000002000000090000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}\WpadDecisionTime = 107d65db84cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\5e-5f-bb-a7-bd-40\WpadDecisionTime = 107d65db84cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}\WpadDecisionTime = 50fdf2e784cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}\WpadDecisionTime = b09674f484cbda01	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}\WpadDecisionReason = "1"	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\5e-5f-bb-a7-bd-40\WpadDecisionTime = 50fdf2e784cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}\WpadDecisionTime = 70d7d40b85cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\5e-5f-bb-a7-bd-40\WpadDecisionTime = 70616e4285cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings = 4600000007000000090000000000000000000000000000000400000000000000000000000000000000000000000000000000000001000000020000000a7f00d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\5e-5f-bb-a7-bd-40\WpadDecisionTime = 30cbba3585cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings = 460000000d000000090000000000000000000000000000000400000000000000000000000000000000000000000000000000000001000000020000000a7f00d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\5e-5f-bb-a7-bd-40\WpadDecisionTime = b09674f484cbda01	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings = 460000000c000000090000000000000000000000000000000400000000000000000000000000000000000000000000000000000001000000020000000a7f00d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}\WpadDecisionTime = 70e4485d85cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}\WpadDecisionTime = 103faa6a85cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\5e-5f-bb-a7-bd-40\WpadDecisionTime = 70d7d40b85cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings = 4600000008000000090000000000000000000000000000000400000000000000000000000000000000000000000000000000000001000000020000000a7f00d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\5e-5f-bb-a7-bd-40\WpadDecisionTime = 30d8f72785cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\5e-5f-bb-a7-bd-40\WpadDecisionTime = 103faa6a85cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings = 4600000003000000090000000000000000000000000000000400000000000000000000000000000000000000000000000000000001000000020000000a7f00d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings = 4600000004000000090000000000000000000000000000000400000000000000000000000000000000000000000000000000000001000000020000000a7f00d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}\WpadNetworkName = "Network 3"	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}\5e-5f-bb-a7-bd-40	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings = 4600000006000000090000000000000000000000000000000400000000000000000000000000000000000000000000000000000001000000020000000a7f00d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}\WpadDecisionTime = 90738d0085cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}\WpadDecisionTime = f091131a85cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings = 460000000a000000090000000000000000000000000000000400000000000000000000000000000000000000000000000000000001000000020000000a7f00d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}\WpadDecisionTime = 70616e4285cbda01	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\ProxyEnable = "0"	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}\WpadDecision = "0"	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\5e-5f-bb-a7-bd-40\WpadDecisionTime = 90738d0085cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}\WpadDecisionTime = 30cbba3585cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\5e-5f-bb-a7-bd-40\WpadDecisionTime = 50eeb74f85cbda01	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\5e-5f-bb-a7-bd-40\WpadDecision = "0"	rundll32.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\5e-5f-bb-a7-bd-40\WpadDetectedUrl	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\5e-5f-bb-a7-bd-40\WpadDecisionTime = 70e4485d85cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\SavedLegacySettings = 4600000002000000090000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\5e-5f-bb-a7-bd-40\WpadDecisionTime = f091131a85cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings = 460000000e000000090000000000000000000000000000000400000000000000000000000000000000000000000000000000000001000000020000000a7f00d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\5e-5f-bb-a7-bd-40	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\5e-5f-bb-a7-bd-40\WpadDecisionReason = "1"	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings = 4600000009000000090000000000000000000000000000000400000000000000000000000000000000000000000000000000000001000000020000000a7f00d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}\WpadDecisionTime = 30d8f72785cbda01	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{DDB8CC54-5585-4BD8-B797-FD0EDB683D86}\WpadDecisionTime = 50eeb74f85cbda01	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2720 wrote to memory of 2488	2720	taskeng.exe	31
PID 2720 wrote to memory of 2488	2720	taskeng.exe	31
PID 2720 wrote to memory of 2488	2720	taskeng.exe	31

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\c437e5caa4f644024014d40e62a5436c59046efc76c666ea3f83ab61df615314.dll
1⤵
- Drops file in Windows directory
PID:1760

C:\Windows\system32\taskeng.exe
taskeng.exe {310B2868-E285-4604-8B13-14907A130886} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:2720
- C:\Windows\system32\rundll32.exe
  C:\Windows\system32\rundll32.exe "C:\ProgramData\RtlUpd\RtlUpd.dll",Start /p
  2⤵
  - Blocklisted process makes network request
  - Loads dropped DLL
  - Drops file in System32 directory
  - Modifies data under HKEY_USERS
  PID:2488

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\RtlUpd\RtlUpd.dll

Filesize
141KB

MD5
5fa10a64b7e1cfc3d8b8d45cefb6f837

SHA1
5f69a841cd4533ba671c1e6f73bd3b65d903f272

SHA256
c437e5caa4f644024014d40e62a5436c59046efc76c666ea3f83ab61df615314

SHA512
98f49ed14fe9fb14c6f0147ff53bb00969be5576f3e8a25ed1b35639390fbb7e88c440a51d451df644e72d2595ebe9748af01230b22400bd5b42ec87685b1306

Download Submit