formbook | dee7026593429404b9cc00a28b12202ecf60049be57f5bf9a0b7dae383055e06

General

Target

PO_20230025-03662.js
Size

633KB
MD5

9659595bb96500ea6ac6892bcb450d03
SHA1

db8e3c13226387bbdd7703abd60baf6e78851789
SHA256

dee7026593429404b9cc00a28b12202ecf60049be57f5bf9a0b7dae383055e06
SHA512

e6da4a8e7d5e99813d581bb18eee55c9aa629a974412887b1f412f6b860283be68f3d47b16d11ee738c2b8e7500b33c42e24f6d20cfb4175598e0c9c99e3a48c

Score

10^/10

formbook vjw0rm xloader vs8g loader persistence rat spyware stealer suricata trojan worm

Malware Config

Extracted

Family

xloader

Version

2.9

Campaign

vs8g

Decoy

xEVEsySadSMf8UUC

H8ZbYtGKWPCfp91+uS3TFo/F7tYacwDqHw==

L/St5UjIhTMzEHsb

8h8tDvq0nl8JCWoagxa0MVyvnA==

7bml44z9jZsZx8Co2T8=

EwH88ZtcOu8ehs2P2o6wv78FEe4+xRQ=

bTn3LpE1HfpPAXI=

nYxT+9GLhS1d3zzGJuTDlgpT

HxonIwh8TesenMCo2T8=

Ki83MiehhC9e1i7YQ/Wd32JsGcun

wHcUByFRMuEGh8Co2T8=

86tqpg/Jy60eFmMRPefDlgpT

grSUYa5yahUf8UUC

HVviVsk7Cb6Elc571pnSWCJ93G17PkiI

6LJ1qBPUtGNIl8Co2T8=

AYuWD33xt44VxsCo2T8=

/smXvLMh868VzQqs99/DlgpT

1kEMNVtaMw6KmN+YANYm+kA=

daarti3nbFVKnsCo2T8=

0EJM6cFFHvawA2U=

Signatures

Formbook
Formbook is a data stealing malware which is capable of stealing data.
trojan spyware stealer formbook
Vjw0rm
Vjw0rm is a remote access trojan written in JavaScript.
trojan worm vjw0rm
Xloader
Xloader is a rebranded version of Formbook malware.
loader xloader
suricata: ET MALWARE FormBook CnC Checkin (GET)
suricata: ET MALWARE FormBook CnC Checkin (GET)
suricata
suricata: ET MALWARE FormBook CnC Checkin (POST) M2
suricata: ET MALWARE FormBook CnC Checkin (POST) M2
suricata

Xloader Payload 6 IoCs

rat

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\bin.exe	xloader
C:\Users\Admin\AppData\Local\Temp\bin.exe	xloader
behavioral2/memory/2684-140-0x00000000012A0000-0x00000000012CC000-memory.dmp	xloader
behavioral2/memory/2684-143-0x00000000012A0000-0x00000000012CC000-memory.dmp	xloader
C:\Program Files (x86)\Kjv18itl\gdirzyl.exe	xloader
C:\Program Files (x86)\Kjv18itl\gdirzyl.exe	xloader

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

chkdsk.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	chkdsk.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\9RNHMZL0VND = "C:\\Program Files (x86)\\Kjv18itl\\gdirzyl.exe"	chkdsk.exe

Blocklisted process makes network request 15 IoCs

Processes:

wscript.exe

flow	pid	process
7	3452	wscript.exe
20	3452	wscript.exe
25	3452	wscript.exe
38	3452	wscript.exe
39	3452	wscript.exe
48	3452	wscript.exe
55	3452	wscript.exe
64	3452	wscript.exe
70	3452	wscript.exe
79	3452	wscript.exe
88	3452	wscript.exe
90	3452	wscript.exe
92	3452	wscript.exe
95	3452	wscript.exe
99	3452	wscript.exe

Executes dropped EXE 2 IoCs

Processes:

bin.exegdirzyl.exe

pid process

2832 bin.exe
1732 gdirzyl.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

wscript.exebin.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation	wscript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation	bin.exe

Drops startup file 2 IoCs

Processes:

wscript.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\KmBIsnwxko.js	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\KmBIsnwxko.js	wscript.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

wscript.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Software\Microsoft\Windows\CurrentVersion\Run	wscript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\YVBPFHTJIQ = "\"C:\\Users\\Admin\\AppData\\Roaming\\KmBIsnwxko.js\""	wscript.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

bin.exechkdsk.exe

description	pid	process	target process
PID 2832 set thread context of 3232	2832	bin.exe	Explorer.EXE
PID 2684 set thread context of 3232	2684	chkdsk.exe	Explorer.EXE

Drops file in Program Files directory 4 IoCs

Processes:

chkdsk.exeExplorer.EXE

description	ioc	process
File opened for modification	C:\Program Files (x86)\Kjv18itl\gdirzyl.exe	chkdsk.exe
File opened for modification	C:\Program Files (x86)\Kjv18itl	Explorer.EXE
File created	C:\Program Files (x86)\Kjv18itl\gdirzyl.exe	Explorer.EXE
File opened for modification	C:\Program Files (x86)\Kjv18itl\gdirzyl.exe	Explorer.EXE

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry
T1012

System Information Discovery
T1082

Processes:

chkdsk.exe

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier chkdsk.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	chkdsk.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

Processes:

chkdsk.exe

description	ioc	process
Key created	\Registry\User\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	chkdsk.exe

Suspicious behavior: EnumeratesProcesses 56 IoCs

Processes:

bin.exechkdsk.exegdirzyl.exe

pid	process
2832	bin.exe
2832	bin.exe
2832	bin.exe
2832	bin.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
1732	gdirzyl.exe
1732	gdirzyl.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe
2684	chkdsk.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

Explorer.EXE

pid process

3232 Explorer.EXE
Suspicious behavior: MapViewOfSection 7 IoCs

Processes:

bin.exechkdsk.exe

pid process

2832 bin.exe
2832 bin.exe
2832 bin.exe
2684 chkdsk.exe
2684 chkdsk.exe
2684 chkdsk.exe
2684 chkdsk.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

bin.exechkdsk.exegdirzyl.exe

description pid process

Token: SeDebugPrivilege 2832 bin.exe
Token: SeDebugPrivilege 2684 chkdsk.exe
Token: SeDebugPrivilege 1732 gdirzyl.exe

pid	process
3232	Explorer.EXE

description	pid	process
Token: SeDebugPrivilege	2832	bin.exe
Token: SeDebugPrivilege	2684	chkdsk.exe
Token: SeDebugPrivilege	1732	gdirzyl.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

wscript.exeExplorer.EXEchkdsk.exe

description	pid	process	target process
PID 2068 wrote to memory of 3452	2068	wscript.exe	wscript.exe
PID 2068 wrote to memory of 3452	2068	wscript.exe	wscript.exe
PID 2068 wrote to memory of 2832	2068	wscript.exe	bin.exe
PID 2068 wrote to memory of 2832	2068	wscript.exe	bin.exe
PID 2068 wrote to memory of 2832	2068	wscript.exe	bin.exe
PID 3232 wrote to memory of 2684	3232	Explorer.EXE	chkdsk.exe
PID 3232 wrote to memory of 2684	3232	Explorer.EXE	chkdsk.exe
PID 3232 wrote to memory of 2684	3232	Explorer.EXE	chkdsk.exe
PID 2684 wrote to memory of 4260	2684	chkdsk.exe	cmd.exe
PID 2684 wrote to memory of 4260	2684	chkdsk.exe	cmd.exe
PID 2684 wrote to memory of 4260	2684	chkdsk.exe	cmd.exe
PID 2684 wrote to memory of 1148	2684	chkdsk.exe	cmd.exe
PID 2684 wrote to memory of 1148	2684	chkdsk.exe	cmd.exe
PID 2684 wrote to memory of 1148	2684	chkdsk.exe	cmd.exe
PID 2684 wrote to memory of 3228	2684	chkdsk.exe	cmd.exe
PID 2684 wrote to memory of 3228	2684	chkdsk.exe	cmd.exe
PID 2684 wrote to memory of 3228	2684	chkdsk.exe	cmd.exe
PID 2684 wrote to memory of 3580	2684	chkdsk.exe	Firefox.exe
PID 2684 wrote to memory of 3580	2684	chkdsk.exe	Firefox.exe
PID 2684 wrote to memory of 3580	2684	chkdsk.exe	Firefox.exe
PID 3232 wrote to memory of 1732	3232	Explorer.EXE	gdirzyl.exe
PID 3232 wrote to memory of 1732	3232	Explorer.EXE	gdirzyl.exe
PID 3232 wrote to memory of 1732	3232	Explorer.EXE	gdirzyl.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Drops file in Program Files directory
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of WriteProcessMemory
PID:3232

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\PO_20230025-03662.js
2⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2068

C:\Windows\System32\wscript.exe
"C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\KmBIsnwxko.js"
3⤵
- Blocklisted process makes network request
- Drops startup file
- Adds Run key to start application
PID:3452

C:\Users\Admin\AppData\Local\Temp\bin.exe
"C:\Users\Admin\AppData\Local\Temp\bin.exe"
3⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:2832

C:\Windows\SysWOW64\chkdsk.exe
"C:\Windows\SysWOW64\chkdsk.exe"
2⤵
- Adds policy Run key to start application
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2684

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\bin.exe"
3⤵
PID:4260

C:\Windows\SysWOW64\cmd.exe
/c copy "C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Login Data" "C:\Users\Admin\AppData\Local\Temp\DB1" /V
3⤵
PID:1148

C:\Windows\SysWOW64\cmd.exe
/c copy "C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Login Data" "C:\Users\Admin\AppData\Local\Temp\DB1" /V
3⤵
PID:3228

C:\Program Files\Mozilla Firefox\Firefox.exe
"C:\Program Files\Mozilla Firefox\Firefox.exe"
3⤵
PID:3580

C:\Program Files (x86)\Kjv18itl\gdirzyl.exe
"C:\Program Files (x86)\Kjv18itl\gdirzyl.exe"
2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1732

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

2

T1060

Privilege Escalation

Defense Evasion

Modify Registry

3

T1112

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

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Downloads

C:\Program Files (x86)\Kjv18itl\gdirzyl.exe
Filesize
174KB

MD5
3ae87cd93196b3f86a2e1cfa3e6c9133

SHA1
64b444869181c8893d695072239bc48681ea10cd

SHA256
0a1b761095e129d76033c7bde535ca8f0517b4ddaaeda3981b5d8f998f8cf407

SHA512
1e1490502069ff5328939cc30a8e1aa74089e9cf918a27c0ce831c877035fe578811fcb970859c88437724c65383e86f055eedad4c14e3699d4270d280b865e8

Download Submit
C:\Program Files (x86)\Kjv18itl\gdirzyl.exe
Filesize
174KB

MD5
3ae87cd93196b3f86a2e1cfa3e6c9133

SHA1
64b444869181c8893d695072239bc48681ea10cd

SHA256
0a1b761095e129d76033c7bde535ca8f0517b4ddaaeda3981b5d8f998f8cf407

SHA512
1e1490502069ff5328939cc30a8e1aa74089e9cf918a27c0ce831c877035fe578811fcb970859c88437724c65383e86f055eedad4c14e3699d4270d280b865e8

Download Submit
C:\Users\Admin\AppData\Local\Temp\DB1
Filesize
40KB

MD5
b608d407fc15adea97c26936bc6f03f6

SHA1
953e7420801c76393902c0d6bb56148947e41571

SHA256
b281ce54125d4250a80f48fcc02a8eea53f2c35c3b726e2512c3d493da0013bf

SHA512
cc96ddf4bf90d6aaa9d86803cb2aa30cd8e9b295aee1bd5544b88aeab63dc60bb1d4641e846c9771bab51aabbfbcd984c6d3ee83b96f5b65d09c0841d464b9e4

Download Submit
C:\Users\Admin\AppData\Local\Temp\DB1
Filesize
48KB

MD5
349e6eb110e34a08924d92f6b334801d

SHA1
bdfb289daff51890cc71697b6322aa4b35ec9169

SHA256
c9fd7be4579e4aa942e8c2b44ab10115fa6c2fe6afd0c584865413d9d53f3b2a

SHA512
2a635b815a5e117ea181ee79305ee1baf591459427acc5210d8c6c7e447be3513ead871c605eb3d32e4ab4111b2a335f26520d0ef8c1245a4af44e1faec44574

Download Submit
C:\Users\Admin\AppData\Local\Temp\bin.exe
Filesize
174KB

MD5
3ae87cd93196b3f86a2e1cfa3e6c9133

SHA1
64b444869181c8893d695072239bc48681ea10cd

SHA256
0a1b761095e129d76033c7bde535ca8f0517b4ddaaeda3981b5d8f998f8cf407

SHA512
1e1490502069ff5328939cc30a8e1aa74089e9cf918a27c0ce831c877035fe578811fcb970859c88437724c65383e86f055eedad4c14e3699d4270d280b865e8

Download Submit
C:\Users\Admin\AppData\Local\Temp\bin.exe
Filesize
174KB

MD5
3ae87cd93196b3f86a2e1cfa3e6c9133

SHA1
64b444869181c8893d695072239bc48681ea10cd

SHA256
0a1b761095e129d76033c7bde535ca8f0517b4ddaaeda3981b5d8f998f8cf407

SHA512
1e1490502069ff5328939cc30a8e1aa74089e9cf918a27c0ce831c877035fe578811fcb970859c88437724c65383e86f055eedad4c14e3699d4270d280b865e8

Download Submit
C:\Users\Admin\AppData\Roaming\KmBIsnwxko.js
Filesize
117KB

MD5
0e20eafe54da8cd708fe740ffca1a02d

SHA1
c8b05acaf83fd25bc55e0ab01b7df98593c7a5f5

SHA256
c0f92a810bb3470ce1fd1e6b532ed371c2bc8d397beb6a29e2ddd68a5ef287b6

SHA512
f8a614ddadfb3e350df15884e976dfcfd94af55b614506a351ab02395c52b20c15b7ffd93e2aefedc1a89b17ed4af84256f4920fae6f4cf19862208e612515f4

Download Submit
memory/1148-147-0x0000000000000000-mapping.dmp

Download
memory/1732-154-0x0000000001590000-0x00000000018DA000-memory.dmp

Filesize
3.3MB

Download
memory/1732-151-0x0000000000000000-mapping.dmp

Download
memory/2684-140-0x00000000012A0000-0x00000000012CC000-memory.dmp

Filesize
176KB

Download
memory/2684-141-0x0000000001B30000-0x0000000001E7A000-memory.dmp

Filesize
3.3MB

Download
memory/2684-139-0x0000000000350000-0x000000000035A000-memory.dmp

Filesize
40KB

Download
memory/2684-143-0x00000000012A0000-0x00000000012CC000-memory.dmp

Filesize
176KB

Download
memory/2684-144-0x0000000001890000-0x0000000001920000-memory.dmp

Filesize
576KB

Download
memory/2684-138-0x0000000000000000-mapping.dmp

Download
memory/2832-136-0x00000000014C0000-0x00000000014D1000-memory.dmp

Filesize
68KB

Download
memory/2832-135-0x00000000019C0000-0x0000000001D0A000-memory.dmp

Filesize
3.3MB

Download
memory/2832-132-0x0000000000000000-mapping.dmp

Download
memory/3228-149-0x0000000000000000-mapping.dmp

Download
memory/3232-137-0x0000000007C70000-0x0000000007DCB000-memory.dmp

Filesize
1.4MB

Download
memory/3232-146-0x0000000007E30000-0x0000000007F73000-memory.dmp

Filesize
1.3MB

Download
memory/3232-145-0x0000000007E30000-0x0000000007F73000-memory.dmp

Filesize
1.3MB

Download
memory/3452-130-0x0000000000000000-mapping.dmp

Download
memory/4260-142-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads