warmcookie | 371cf9bcf9a3d7b11d5ac386bef9450beac8c66a546fea1ca9cf629cdb751825

General

Target

f4d2c9470b322af29b9188a3a590cbe85bacb9cc8fcd7c2e94d82271ded3f659.dll
Size

155KB
MD5

7a799f4f9aa63745a75b901a392aff29
SHA1

b9983463f637191ba12c2270ac52a547676a7037
SHA256

f4d2c9470b322af29b9188a3a590cbe85bacb9cc8fcd7c2e94d82271ded3f659
SHA512

e9eeb340dd620256d543ab43d08ccc23b555afa332c744c629fd8f40760f20a24e234955fc8d2e78a150f09028ca7a11650e0da157fff64833f13ce89a208c23
SSDEEP

3072:0lCt2jrijQEjnMUWzsjhVPbuGHUluQj6vkZD4vP5iZWyLr:QCIrijNMv6XPbr0kuNr

Score

10^/10

warmcookie backdoor discovery

Malware Config

Extracted

Family

warmcookie

C2

72.5.43.29

Attributes

mutex
a208f030-25f9-4f41-8b57-6b0b7ecccf29
user_agent
Mozilla / 5.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.0.3705)

Signatures

Warmcookie, Badspace
Warmcookie aka Badspace is a backdoor written in C++.
backdoor warmcookie

Blocklisted process makes network request 6 IoCs

flow	pid	Process
4	780	rundll32.exe
7	780	rundll32.exe
8	780	rundll32.exe
9	780	rundll32.exe
10	780	rundll32.exe
11	780	rundll32.exe

Loads dropped DLL 4 IoCs

pid	Process
780	rundll32.exe
780	rundll32.exe
780	rundll32.exe
780	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\Tandem.job	regsvr32.exe

Modifies data under HKEY_USERS 18 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{3CD1F51E-0F79-4BDC-A4C7-321F7B6D35B5}\22-74-99-1a-6e-99	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\22-74-99-1a-6e-99\WpadDecisionTime = c0e15b46a9f4da01	rundll32.exe
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 = 4600000002000000090000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{3CD1F51E-0F79-4BDC-A4C7-321F7B6D35B5}	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{3CD1F51E-0F79-4BDC-A4C7-321F7B6D35B5}\WpadDecision = "0"	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\Connections\SavedLegacySettings = 4600000002000000090000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{3CD1F51E-0F79-4BDC-A4C7-321F7B6D35B5}\WpadDecisionReason = "1"	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\22-74-99-1a-6e-99\WpadDecisionReason = "1"	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\ProxyEnable = "0"	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings = 4600000003000000090000000000000000000000000000000400000000000000000000000000000000000000000000000000000001000000020000000a7f0028000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\22-74-99-1a-6e-99\WpadDecision = "0"	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{3CD1F51E-0F79-4BDC-A4C7-321F7B6D35B5}\WpadDecisionTime = c0e15b46a9f4da01	rundll32.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{3CD1F51E-0F79-4BDC-A4C7-321F7B6D35B5}\WpadNetworkName = "Network 3"	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\22-74-99-1a-6e-99	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2792 wrote to memory of 780	2792	taskeng.exe	32
PID 2792 wrote to memory of 780	2792	taskeng.exe	32
PID 2792 wrote to memory of 780	2792	taskeng.exe	32

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\f4d2c9470b322af29b9188a3a590cbe85bacb9cc8fcd7c2e94d82271ded3f659.dll
1⤵
- Drops file in Windows directory
PID:2308

C:\Windows\system32\taskeng.exe
taskeng.exe {8156B887-6E3F-4AB8-A410-C763FD2285F9} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:2792
- C:\Windows\system32\rundll32.exe
  C:\Windows\system32\rundll32.exe "C:\ProgramData\Tandem\Updater.dll",Start /u
  2⤵
  - Blocklisted process makes network request
  - Loads dropped DLL
  - Drops file in System32 directory
  - Modifies data under HKEY_USERS
  PID:780

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\Tandem\Updater.dll

Filesize
155KB

MD5
7a799f4f9aa63745a75b901a392aff29

SHA1
b9983463f637191ba12c2270ac52a547676a7037

SHA256
f4d2c9470b322af29b9188a3a590cbe85bacb9cc8fcd7c2e94d82271ded3f659

SHA512
e9eeb340dd620256d543ab43d08ccc23b555afa332c744c629fd8f40760f20a24e234955fc8d2e78a150f09028ca7a11650e0da157fff64833f13ce89a208c23

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