squirrelwaffle | 07c7cb49350bf3c6de4193fb2eeb8dd92d6662d60393ebd483a54bac80fb0b44

Analysis

max time kernel
145s
max time network
151s
platform
windows10_x64
resource
win10-de-20210920
submitted
25-09-2021 00:05

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General

Target

test1.test.dll
Size

309KB
MD5

3d77d7a2e2697d35b281123afe4b030c
SHA1

4087259179a6761e376dcfbf2e981e1c0cacc287
SHA256

07c7cb49350bf3c6de4193fb2eeb8dd92d6662d60393ebd483a54bac80fb0b44
SHA512

8c1645fa7bf81be88533e9aff8a308311f637e3d0b64244a4fa1679de53f706b9222d4bc9caa82f1340dea641d33feb3dfa3b67b2cd324a65bf570b18bf3a17c

Score

10^/10

squirrelwaffle downloader persistence suricata

Malware Config

Extracted

Family

squirrelwaffle

hutraders.com/0eeUtmJf8O

goodartishard.com/0JXDM9kMwx

now.byteinsure.com/tnjUrmlhN

asceaub.com/Xl8UCLSU

colchonesmanzur.com/GjVgBnKaNIC

sistemasati.com/0SzGNkx6P

maldivehost.net/zLIisQRWZI9

lrdgon.org/l7r96tjAJ

binnawaz.com.pk/jhSZGWS76C

fhstorse.com/vJlgdjJnpIop

Signatures

Registers COM server for autorun 1 TTPs
persistence

Registry Run Keys / Startup Folder
T1060
SquirrelWaffle is a simple downloader written in C++.
SquirrelWaffle.
downloader squirrelwaffle
suricata: ET MALWARE Possible SQUIRRELWAFFLE Server Response
suricata: ET MALWARE Possible SQUIRRELWAFFLE Server Response
suricata
suricata: ET MALWARE SQUIRRELWAFFLE Loader Activity (POST)
suricata: ET MALWARE SQUIRRELWAFFLE Loader Activity (POST)
suricata
suricata: ET MALWARE SQUIRRELWAFFLE Server Response
suricata: ET MALWARE SQUIRRELWAFFLE Server Response
suricata

squirrelwaffle 2 IoCs

Squirrelwaffle Payload

resource	yara_rule
behavioral8/memory/4100-118-0x0000000074020000-0x00000000740FF000-memory.dmp	squirrelwaffle
behavioral8/memory/4100-117-0x0000000074020000-0x0000000074030000-memory.dmp	squirrelwaffle

Blocklisted process makes network request 5 IoCs

flow	pid	Process
25	4100	rundll32.exe
26	4100	rundll32.exe
30	4100	rundll32.exe
33	4100	rundll32.exe
34	4100	rundll32.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\counters2.dat	OfficeC2RClient.exe
File opened for modification	C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\Office\OTele\officec2rclient.exe.db	OfficeC2RClient.exe
File opened for modification	C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\Office\OTele\officec2rclient.exe.db-wal	OfficeC2RClient.exe
File opened for modification	C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\Office\OTele\officec2rclient.exe.db-shm	OfficeC2RClient.exe

Modifies data under HKEY_USERS 23 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\ExperimentEcs\officeclicktorun\Overrides	OfficeC2RClient.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\ExperimentConfigs\FirstSession\officeclicktorun	OfficeC2RClient.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\LanguageResources\EnabledEditingLanguages\en-US = "2"	OfficeC2RClient.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\ClientTelemetry\RulesMetadata\officec2rclient.exe	OfficeC2RClient.exe
Key deleted	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\ClientTelemetry\RulesMetadata\officec2rclient.exe\ULSMonitor	OfficeC2RClient.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\ClientTelemetry\RulesMetadata\officec2rclient.exe\ULSMonitor\ULSCategoriesSeverities = "1329 10,1329 50,941 10,1329 15,941 15,941 6,1329 100,1329 6"	OfficeC2RClient.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\Common\ClientTelemetry	OfficeC2RClient.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\ExperimentConfigs\Ecs	OfficeC2RClient.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\ExperimentConfigs\ExternalFeatureOverrides\officeclicktorun	OfficeC2RClient.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\ClientTelemetry\RulesMetadata\officec2rclient.exe\ULSMonitor	OfficeC2RClient.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common	OfficeC2RClient.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\ClientTelemetry	OfficeC2RClient.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\Common\ClientTelemetry\Volatile	OfficeC2RClient.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\ExperimentConfigs\Ecs\officeclicktorun	OfficeC2RClient.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\ExperimentEcs\all\Overrides	OfficeC2RClient.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\ExperimentConfigs\Ecs\officeclicktorun\ConfigContextData	OfficeC2RClient.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\ClientTelemetry\RulesMetadata\officec2rclient.exe\ULSMonitor\ULSTagIds0 = "5804129,17110992,7202269,17110988,7153487,39965824,17962391,17962392,3702920,3462423,3700754,3965062,4297094,7153421,18716193,7153435,7202265,20502174,6308191,18407617"	OfficeC2RClient.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\ExperimentEcs\Overrides	OfficeC2RClient.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\LanguageResources\EnabledEditingLanguages\en-US = "1"	OfficeC2RClient.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\TrustCenter\Experimentation	OfficeC2RClient.exe
Key deleted	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\ClientTelemetry\RulesMetadata\officec2rclient.exe	OfficeC2RClient.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0	OfficeC2RClient.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Office\16.0\Common\ClientTelemetry\RulesMetadata	OfficeC2RClient.exe

Modifies registry class 44 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\System.IsPinnedToNameSpaceTree = "1"	FileSyncConfig.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\ShellFolder\FolderValueFlags = "40"	FileSyncConfig.exe
Key created	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\InProcServer32	FileSyncConfig.exe
Key created	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance	FileSyncConfig.exe
Key deleted	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}	FileSyncConfig.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\ShellFolder\Attributes = "4034920525"	FileSyncConfig.exe
Key created	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}	FileSyncConfig.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\ = "OneDrive"	FileSyncConfig.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\SortOrderIndex = "66"	FileSyncConfig.exe
Key created	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\InitPropertyBag	FileSyncConfig.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\CLSID = "{0E5AAE11-A475-4c5b-AB00-C66DE400274E}"	FileSyncConfig.exe
Key created	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\InitPropertyBag	FileSyncConfig.exe
Key created	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\ShellFolder	FileSyncConfig.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\ShellFolder\FolderValueFlags = "40"	FileSyncConfig.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\InProcServer32\ = "%systemroot%\\system32\\shell32.dll"	FileSyncConfig.exe
Key deleted	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_CLASSES\WOW6432NODE\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\SHELLFOLDER	FileSyncConfig.exe
Key deleted	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_CLASSES\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\DEFAULTICON	FileSyncConfig.exe
Key created	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}	FileSyncConfig.exe
Key created	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance	FileSyncConfig.exe
Key created	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\ShellFolder	FileSyncConfig.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\System.IsPinnedToNameSpaceTree = "1"	FileSyncConfig.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\DefaultIcon\ = "C:\\Users\\Admin\\AppData\\Local\\Microsoft\\OneDrive\\OneDrive.exe,0"	FileSyncConfig.exe
Key deleted	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance	FileSyncConfig.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\ = "OneDrive"	FileSyncConfig.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\DefaultIcon\ = "C:\\Users\\Admin\\AppData\\Local\\Microsoft\\OneDrive\\OneDrive.exe,0"	FileSyncConfig.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\InitPropertyBag\Attributes = "17"	FileSyncConfig.exe
Key deleted	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_CLASSES\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\INPROCSERVER32	FileSyncConfig.exe
Key deleted	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance	FileSyncConfig.exe
Key deleted	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_CLASSES\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\SHELLFOLDER	FileSyncConfig.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\SortOrderIndex = "66"	FileSyncConfig.exe
Key created	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\DefaultIcon	FileSyncConfig.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\InitPropertyBag\Attributes = "17"	FileSyncConfig.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\InitPropertyBag\TargetKnownFolder = "{a52bba46-e9e1-435f-b3d9-28daa648c0f6}"	FileSyncConfig.exe
Key deleted	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}	FileSyncConfig.exe
Key created	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\InProcServer32	FileSyncConfig.exe
Key created	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\DefaultIcon	FileSyncConfig.exe
Key deleted	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_CLASSES\WOW6432NODE\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\INPROCSERVER32	FileSyncConfig.exe
Key deleted	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_CLASSES\WOW6432NODE\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\INSTANCE\INITPROPERTYBAG	FileSyncConfig.exe
Key deleted	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_CLASSES\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\INSTANCE\INITPROPERTYBAG	FileSyncConfig.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\InProcServer32\ = "%systemroot%\\SysWow64\\shell32.dll"	FileSyncConfig.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\CLSID = "{0E5AAE11-A475-4c5b-AB00-C66DE400274E}"	FileSyncConfig.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\WOW6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\InitPropertyBag\TargetKnownFolder = "{a52bba46-e9e1-435f-b3d9-28daa648c0f6}"	FileSyncConfig.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\ShellFolder\Attributes = "4034920525"	FileSyncConfig.exe
Key deleted	\REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000_CLASSES\WOW6432NODE\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\DEFAULTICON	FileSyncConfig.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4076	OfficeC2RClient.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4268 wrote to memory of 4100	4268	rundll32.exe	75
PID 4268 wrote to memory of 4100	4268	rundll32.exe	75
PID 4268 wrote to memory of 4100	4268	rundll32.exe	75

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\test1.test.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4268
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\test1.test.dll,#1
  2⤵
  - Blocklisted process makes network request
  PID:4100

C:\Users\Admin\AppData\Local\Microsoft\OneDrive\21.170.0822.0002\FileSyncConfig.exe
"C:\Users\Admin\AppData\Local\Microsoft\OneDrive\21.170.0822.0002\FileSyncConfig.exe"
1⤵
- Modifies registry class
PID:1144

C:\Program Files\Common Files\Microsoft Shared\ClickToRun\OfficeC2RClient.exe
"C:\Program Files\Common Files\Microsoft Shared\ClickToRun\OfficeC2RClient.exe" /frequentupdate SCHEDULEDTASK displaylevel=False
1⤵
- Drops file in System32 directory
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:4076

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/4100-116-0x0000000002B40000-0x0000000002C8A000-memory.dmp

Filesize
1.3MB

Download
memory/4100-118-0x0000000074020000-0x00000000740FF000-memory.dmp

Filesize
892KB

Download
memory/4100-117-0x0000000074020000-0x0000000074030000-memory.dmp

Filesize
64KB

Download