formbook | 354e6dcfaea16e4f37c6608a890b23a6a801b976f3dc4d11db6274014045d9a4

General

Target

osc.js
Size

380KB
MD5

ec13e690ff5ea4cae17f1862b9fa8f3e
SHA1

45963548c7604ac4ead234c6605d0a67e9d29cdf
SHA256

354e6dcfaea16e4f37c6608a890b23a6a801b976f3dc4d11db6274014045d9a4
SHA512

9bb1635b17a41293f7f094947466d45553a16d0209bb6155d5d9d3da3ab8ac8a3e0e2d91a54d85c24b893cb78313bb0d2840d210424a82f94add1f9d515925bb

Score

10^/10

formbook vjw0rm xloader r4wf loader persistence rat spyware stealer suricata trojan worm

Malware Config

Extracted

Family

xloader

Version

2.8

Campaign

r4wf

Decoy

eQLhwti8E4CX1m8bp0WK2Q==

axoAyf6nwR9Y43o1nFx+930=

vf9fMlHrgdcI

TRQU8PPgFWegAcLFsjQ5TUX2

CFXUiz7SjsLqcQ==

XKeIL6Nmg+8pokY+wjaooasXRQIt

NLSkgIdanO/4SNPAdlKUrIms7Q==

TTKhgqyuCnCmH7yGa12g8HXrnY/nKGI=

5X0d70pNfaYGRgI=

fXXOk9C1+U9bhkIBIqn8

dN7HmMiv/TtAgyP2tYrEG2Yq4Yw=

HRqUgbJeorn4Zg==

MZ7Sh6xm71vhCNLW

7iFsO188fKYGRgI=

o9VC9kgPVXmCz2gBIqn8

B0y+iMbD+lzhCNLW

ciUeBS0WbdHuVGH+xJU=

Q3334PeyxydNmzoBIqn8

kgHx3RbrgdcI

WQjgo8h9g6YGRgI=

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\greatk.exe	xloader
C:\Users\Admin\AppData\Local\Temp\greatk.exe	xloader
behavioral2/memory/428-140-0x0000000001200000-0x000000000122C000-memory.dmp	xloader
behavioral2/memory/428-144-0x0000000001200000-0x000000000122C000-memory.dmp	xloader
C:\Program Files (x86)\F6l70n\gfixnltz8d.exe	xloader
C:\Program Files (x86)\F6l70n\gfixnltz8d.exe	xloader

Blocklisted process makes network request 16 IoCs

Processes:

wscript.exe

flow	pid	process
2	3412	wscript.exe
11	3412	wscript.exe
18	3412	wscript.exe
29	3412	wscript.exe
34	3412	wscript.exe
40	3412	wscript.exe
47	3412	wscript.exe
54	3412	wscript.exe
58	3412	wscript.exe
61	3412	wscript.exe
66	3412	wscript.exe
70	3412	wscript.exe
71	3412	wscript.exe
73	3412	wscript.exe
77	3412	wscript.exe
86	3412	wscript.exe

Executes dropped EXE 2 IoCs

Processes:

greatk.exegfixnltz8d.exe

pid process

3948 greatk.exe
1528 gfixnltz8d.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.exegreatk.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Control Panel\International\Geo\Nation	wscript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Control Panel\International\Geo\Nation	greatk.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\mEuDqwvosV.js	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\mEuDqwvosV.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 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

wscript.exeraserver.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Software\Microsoft\Windows\CurrentVersion\Run	wscript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\YVBPFHTJIQ = "\"C:\\Users\\Admin\\AppData\\Roaming\\mEuDqwvosV.js\""	wscript.exe
Key created	\Registry\Machine\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run	raserver.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\9RAXLR20T8 = "C:\\Program Files (x86)\\F6l70n\\gfixnltz8d.exe"	raserver.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

greatk.exeraserver.exe

description	pid	process	target process
PID 3948 set thread context of 2832	3948	greatk.exe	Explorer.EXE
PID 428 set thread context of 2832	428	raserver.exe	Explorer.EXE

Drops file in Program Files directory 4 IoCs

Processes:

raserver.exeExplorer.EXE

description	ioc	process
File opened for modification	C:\Program Files (x86)\F6l70n\gfixnltz8d.exe	raserver.exe
File opened for modification	C:\Program Files (x86)\F6l70n	Explorer.EXE
File created	C:\Program Files (x86)\F6l70n\gfixnltz8d.exe	Explorer.EXE
File opened for modification	C:\Program Files (x86)\F6l70n\gfixnltz8d.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

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

Processes:

raserver.exe

description	ioc	process
Key created	\Registry\User\S-1-5-21-1081944012-3634099177-1681222835-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	raserver.exe

Suspicious behavior: EnumeratesProcesses 58 IoCs

Processes:

greatk.exeraserver.exegfixnltz8d.exe

pid	process
3948	greatk.exe
3948	greatk.exe
3948	greatk.exe
3948	greatk.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
1528	gfixnltz8d.exe
1528	gfixnltz8d.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe
428	raserver.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

Explorer.EXE

pid process

2832 Explorer.EXE
Suspicious behavior: MapViewOfSection 7 IoCs

Processes:

greatk.exeraserver.exe

pid process

3948 greatk.exe
3948 greatk.exe
3948 greatk.exe
428 raserver.exe
428 raserver.exe
428 raserver.exe
428 raserver.exe

pid	process
2832	Explorer.EXE

Suspicious use of AdjustPrivilegeToken 7 IoCs

Processes:

greatk.exeraserver.exeExplorer.EXEgfixnltz8d.exe

description	pid	process
Token: SeDebugPrivilege	3948	greatk.exe
Token: SeDebugPrivilege	428	raserver.exe
Token: SeShutdownPrivilege	2832	Explorer.EXE
Token: SeCreatePagefilePrivilege	2832	Explorer.EXE
Token: SeDebugPrivilege	1528	gfixnltz8d.exe
Token: SeShutdownPrivilege	2832	Explorer.EXE
Token: SeCreatePagefilePrivilege	2832	Explorer.EXE

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

wscript.exeExplorer.EXEraserver.exe

description	pid	process	target process
PID 3240 wrote to memory of 3412	3240	wscript.exe	wscript.exe
PID 3240 wrote to memory of 3412	3240	wscript.exe	wscript.exe
PID 3240 wrote to memory of 3948	3240	wscript.exe	greatk.exe
PID 3240 wrote to memory of 3948	3240	wscript.exe	greatk.exe
PID 3240 wrote to memory of 3948	3240	wscript.exe	greatk.exe
PID 2832 wrote to memory of 428	2832	Explorer.EXE	raserver.exe
PID 2832 wrote to memory of 428	2832	Explorer.EXE	raserver.exe
PID 2832 wrote to memory of 428	2832	Explorer.EXE	raserver.exe
PID 428 wrote to memory of 2884	428	raserver.exe	cmd.exe
PID 428 wrote to memory of 2884	428	raserver.exe	cmd.exe
PID 428 wrote to memory of 2884	428	raserver.exe	cmd.exe
PID 428 wrote to memory of 1344	428	raserver.exe	cmd.exe
PID 428 wrote to memory of 1344	428	raserver.exe	cmd.exe
PID 428 wrote to memory of 1344	428	raserver.exe	cmd.exe
PID 428 wrote to memory of 908	428	raserver.exe	cmd.exe
PID 428 wrote to memory of 908	428	raserver.exe	cmd.exe
PID 428 wrote to memory of 908	428	raserver.exe	cmd.exe
PID 428 wrote to memory of 4948	428	raserver.exe	Firefox.exe
PID 428 wrote to memory of 4948	428	raserver.exe	Firefox.exe
PID 428 wrote to memory of 4948	428	raserver.exe	Firefox.exe
PID 2832 wrote to memory of 1528	2832	Explorer.EXE	gfixnltz8d.exe
PID 2832 wrote to memory of 1528	2832	Explorer.EXE	gfixnltz8d.exe
PID 2832 wrote to memory of 1528	2832	Explorer.EXE	gfixnltz8d.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Drops file in Program Files directory
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2832

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\osc.js
2⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3240

C:\Windows\System32\wscript.exe
"C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\mEuDqwvosV.js"
3⤵
- Blocklisted process makes network request
- Drops startup file
- Adds Run key to start application
PID:3412

C:\Users\Admin\AppData\Local\Temp\greatk.exe
"C:\Users\Admin\AppData\Local\Temp\greatk.exe"
3⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:3948

C:\Windows\SysWOW64\raserver.exe
"C:\Windows\SysWOW64\raserver.exe"
2⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- Modifies Internet Explorer settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:428

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\greatk.exe"
3⤵
PID:2884

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:1344

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:908

C:\Program Files\Mozilla Firefox\Firefox.exe
"C:\Program Files\Mozilla Firefox\Firefox.exe"
3⤵
PID:4948

C:\Program Files (x86)\F6l70n\gfixnltz8d.exe
"C:\Program Files (x86)\F6l70n\gfixnltz8d.exe"
2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1528

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

2

T1112

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Program Files (x86)\F6l70n\gfixnltz8d.exe
Filesize
174KB

MD5
4e4fe9a1e4568efac0293fcaf431f2da

SHA1
c17588029ab95904ab548b5c8fb4dc626e1d8d12

SHA256
929b0c7d953ee579a49a6d4a9456a1a45a9f4e81933adf6a07b34d6669f096b6

SHA512
7a323280ef25c208fbe726e5ba21200ec9af976f30da3ea330387afe95c41ad082404d4cd811672f0b7e9764759c8cc7b1b2252da242ff8253e429bb2cc7a461

Download Submit
C:\Program Files (x86)\F6l70n\gfixnltz8d.exe
Filesize
174KB

MD5
4e4fe9a1e4568efac0293fcaf431f2da

SHA1
c17588029ab95904ab548b5c8fb4dc626e1d8d12

SHA256
929b0c7d953ee579a49a6d4a9456a1a45a9f4e81933adf6a07b34d6669f096b6

SHA512
7a323280ef25c208fbe726e5ba21200ec9af976f30da3ea330387afe95c41ad082404d4cd811672f0b7e9764759c8cc7b1b2252da242ff8253e429bb2cc7a461

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\greatk.exe
Filesize
174KB

MD5
4e4fe9a1e4568efac0293fcaf431f2da

SHA1
c17588029ab95904ab548b5c8fb4dc626e1d8d12

SHA256
929b0c7d953ee579a49a6d4a9456a1a45a9f4e81933adf6a07b34d6669f096b6

SHA512
7a323280ef25c208fbe726e5ba21200ec9af976f30da3ea330387afe95c41ad082404d4cd811672f0b7e9764759c8cc7b1b2252da242ff8253e429bb2cc7a461

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

MD5
4e4fe9a1e4568efac0293fcaf431f2da

SHA1
c17588029ab95904ab548b5c8fb4dc626e1d8d12

SHA256
929b0c7d953ee579a49a6d4a9456a1a45a9f4e81933adf6a07b34d6669f096b6

SHA512
7a323280ef25c208fbe726e5ba21200ec9af976f30da3ea330387afe95c41ad082404d4cd811672f0b7e9764759c8cc7b1b2252da242ff8253e429bb2cc7a461

Download Submit
C:\Users\Admin\AppData\Roaming\mEuDqwvosV.js
Filesize
24KB

MD5
23c9799ce08ff500a123e55cccb65dda

SHA1
30bcdb93d1262d9dd3ef022266e95df8818ae537

SHA256
46b695af2a9b7e8d824948ee8019b2f3d3b74666450f47c3f8d172468c256286

SHA512
19beb6f22196c35a3214662845e34a1176a533774c8ac2ecbf122d4be785c77e58766ec72d26d13555edd7ab6e18a087f0d4b68ae821f8fc41111b8987bd8930

Download Submit
memory/428-140-0x0000000001200000-0x000000000122C000-memory.dmp

Filesize
176KB

Download
memory/428-138-0x0000000000000000-mapping.dmp

Download
memory/428-139-0x00000000000E0000-0x00000000000FF000-memory.dmp

Filesize
124KB

Download
memory/428-142-0x00000000031A0000-0x00000000034EA000-memory.dmp

Filesize
3.3MB

Download
memory/428-143-0x0000000002FD0000-0x0000000003060000-memory.dmp

Filesize
576KB

Download
memory/428-144-0x0000000001200000-0x000000000122C000-memory.dmp

Filesize
176KB

Download
memory/908-149-0x0000000000000000-mapping.dmp

Download
memory/1344-147-0x0000000000000000-mapping.dmp

Download
memory/1528-151-0x0000000000000000-mapping.dmp

Download
memory/1528-154-0x0000000000EA0000-0x00000000011EA000-memory.dmp

Filesize
3.3MB

Download
memory/2832-137-0x0000000008790000-0x00000000088D3000-memory.dmp

Filesize
1.3MB

Download
memory/2832-145-0x00000000084B0000-0x0000000008557000-memory.dmp

Filesize
668KB

Download
memory/2832-146-0x00000000084B0000-0x0000000008557000-memory.dmp

Filesize
668KB

Download
memory/2884-141-0x0000000000000000-mapping.dmp

Download
memory/3412-130-0x0000000000000000-mapping.dmp

Download
memory/3948-136-0x0000000001340000-0x0000000001351000-memory.dmp

Filesize
68KB

Download
memory/3948-135-0x0000000001920000-0x0000000001C6A000-memory.dmp

Filesize
3.3MB

Download
memory/3948-132-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads