warmcookie | a75cab3593ad35620817235a9bd7938c7adaa8b3ce12a2da20e3e145ac304346

General

Target

l.js
Size

747KB
MD5

97835729c58cae6501e9b3a3776e9906
SHA1

63012f62e00a491b83adaba8804d890ac809490a
SHA256

a75cab3593ad35620817235a9bd7938c7adaa8b3ce12a2da20e3e145ac304346
SHA512

0ed5d7c90dbb260a732dd990d40a69f0997f8390db0a4cecc18349965e052e13ff8f5ecb709b95b176cc7e3686fbb08775e4b97b2253aa7aef9a1212607e8964
SSDEEP

12288:q/VoiDR8Cx2ouvoqEZTwXasSNKF+uV6VBEx2:q/Vok2tI+w

Score

10^/10

warmcookie backdoor defense_evasion discovery execution

Malware Config

Extracted

Family

warmcookie

C2

149.248.58.85

Attributes

mutex
3e4d7a5b-aa72-4d5f-8f8c-b292257af55c
user_agent
Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0

Signatures

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

Blocklisted process makes network request 1 IoCs

flow	pid	Process
4	1228	rundll32.exe

Loads dropped DLL 5 IoCs

pid	Process
2448	msiexec.EXE
1228	rundll32.exe
1228	rundll32.exe
1228	rundll32.exe
1228	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

Deobfuscate/Decode Files or Information 1 TTPs 1 IoCs

Payload decoded via CertUtil.

defense_evasion

Deobfuscate/Decode Files or Information

T1140

pid	Process
2368	certutil.EXE

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\SynergyTop.job	msiexec.EXE

Command and Scripting Interpreter: JavaScript 1 TTPs
execution

JavaScript
T1059.007

Modifies data under HKEY_USERS 18 IoCs

description	ioc	Process
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\da-26-4b-38-02-0f\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\DefaultConnectionSettings = 4600000002000000090000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\da-26-4b-38-02-0f	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\SavedLegacySettings = 4600000002000000090000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{C38A7C33-C812-4E71-BCA9-2E32D765537B}	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{C38A7C33-C812-4E71-BCA9-2E32D765537B}\WpadDecisionTime = 80b679986f6fdb01	rundll32.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{C38A7C33-C812-4E71-BCA9-2E32D765537B}\WpadNetworkName = "Network 3"	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{C38A7C33-C812-4E71-BCA9-2E32D765537B}\da-26-4b-38-02-0f	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 = 4600000003000000090000000000000000000000000000000400000000000000000000000000000000000000000000000000000001000000020000000a7f00aa000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{C38A7C33-C812-4E71-BCA9-2E32D765537B}\WpadDecision = "0"	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\da-26-4b-38-02-0f\WpadDecisionReason = "1"	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\da-26-4b-38-02-0f\WpadDecisionTime = 80b679986f6fdb01	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{C38A7C33-C812-4E71-BCA9-2E32D765537B}\WpadDecisionReason = "1"	rundll32.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 2672 wrote to memory of 2368	2672	taskeng.exe	31
PID 2672 wrote to memory of 2368	2672	taskeng.exe	31
PID 2672 wrote to memory of 2368	2672	taskeng.exe	31
PID 2672 wrote to memory of 2448	2672	taskeng.exe	34
PID 2672 wrote to memory of 2448	2672	taskeng.exe	34
PID 2672 wrote to memory of 2448	2672	taskeng.exe	34
PID 2672 wrote to memory of 2448	2672	taskeng.exe	34
PID 2672 wrote to memory of 2448	2672	taskeng.exe	34
PID 320 wrote to memory of 1228	320	taskeng.exe	36
PID 320 wrote to memory of 1228	320	taskeng.exe	36
PID 320 wrote to memory of 1228	320	taskeng.exe	36

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\l.js
1⤵
PID:2660

C:\Windows\system32\taskeng.exe
taskeng.exe {D533E812-0FAB-40DE-AEBB-24D5C2B3932B} S-1-5-21-3290804112-2823094203-3137964600-1000:VORHPBAB\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2672
- C:\Windows\system32\certutil.EXE
  C:\Windows\system32\certutil.EXE -decode radF29BF.tmp rad4C855.tmp
  2⤵
  - Deobfuscate/Decode Files or Information
  PID:2368
- C:\Windows\system32\msiexec.EXE
  C:\Windows\system32\msiexec.EXE /y C:\Users\Admin\AppData\Local\Temp\rad4C855.tmp
  2⤵
  - Loads dropped DLL
  - Drops file in Windows directory
  PID:2448

C:\Windows\system32\taskeng.exe
taskeng.exe {626A66DB-36BE-46ED-A259-A01245904C86} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:320
- C:\Windows\system32\rundll32.exe
  C:\Windows\system32\rundll32.exe "C:\ProgramData\SynergyTop\Updater.dll",Start /u
  2⤵
  - Blocklisted process makes network request
  - Loads dropped DLL
  - Drops file in System32 directory
  - Modifies data under HKEY_USERS
  PID:1228

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

JavaScript

1

T1059.007

Persistence

Privilege Escalation

Defense Evasion

Deobfuscate/Decode Files or Information

1

T1140

Credential Access

Discovery

Query Registry

2

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\rad4C855.tmp

Filesize
53KB

MD5
1a28984d6db3abdb967c0c19b56f887d

SHA1
b815a93dedd5575a77b5fa9c0d77a9bc783cdb27

SHA256
b2b67092d3978b0a199c949591bb1872cbc49b91494726a513be407abc2ca6a9

SHA512
63e255c48e9c36485e6e7bc31319fd407027829713cef93dd61edf132949ce3c2de741a70f6ba90347e3d0aa7112acc95b71a7405711eab925f5a491cd5d513f

Download Submit
C:\Users\Admin\AppData\Local\Temp\radF29BF.tmp

Filesize
71KB

MD5
76e5a2cad9cc7f4d716f68bcb952b068

SHA1
0a249123c5f2c6f49cd7e650323e9eadb19f7e07

SHA256
e4e8ad7da6aedb908e277c4e5ee733c9e29acd2268aaf91d1341eeb55b3fb806

SHA512
6ad6910d26efa258faeedc03df2b9df4f295294be66a9701c577f107e975d8a00022c89f95f986e1aa85bcfdad0d8ee6faad32e17701ce56b59542642925ee78

Download Submit
memory/1228-13-0x0000000068B80000-0x0000000068B97000-memory.dmp

Filesize
92KB

Download
memory/2448-5-0x0000000068B80000-0x0000000068B97000-memory.dmp

Filesize
92KB

Download

Analysis

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