formbook | efb10cca23c4ed132ed9e516dee40bb2906696b91983947507cd05cb9561f6b3

Analysis

max time kernel
189s
max time network
202s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
04-10-2022 06:08

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General

Target

tmp.exe
Size

475KB
MD5

7241c4a2af9e08ca229912f6c95c72fe
SHA1

2cdc9f81881cb3bfb7a825bb7c8608922a5ee311
SHA256

efb10cca23c4ed132ed9e516dee40bb2906696b91983947507cd05cb9561f6b3
SHA512

b200d33df0abf7b1dd0462a6c1a6f26f70146cc50c0976c5734b3777290e5b36462cb59f903952f6d22ce22fecf85b64da2328b8f4d5d290cce49fe1834acf53
SSDEEP

6144:lTouKrWBEu3/Z2lpGDHU3ykJ1tC/vOpBjhttFujz1rp/nkQ060AtH15Wc0:lToPWBv/cpGrU3y8tGvo18X/XZn5X0

Score

10^/10

formbook u8ow persistence rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Campaign

u8ow

Decoy

j5a7vTwyeK/qHg==

M2qzs6QwZ5sVSqCc

7KoU1t9NdRnqZ8ML+cB8x38C

pgeKvdoqNNao7Cr94QiDuw==

/QZJhRORtafU/zeqK4o+

2JvqeTAGpQBYdqgXoA4=

5zJ7fa0A0PgCFA==

cnq44WjiBQ5VfKgXoA4=

oAp6hcdNVbr2NaHk4QiDuw==

Z/w2v4V/zV8aVoFnW0zzSt6hYjbD

WJ74K7ehJCNed6gXoA4=

hCRY0pmWSLhPzeTztw==

ZNhbVFvL8KKYyj2udtFXr3U8T6LZeQ==

ur75Bj2XjwVNhAGA

BlhiocrRF/kDFg==

aQY19Du631WFpEg=

yGCGEReSv1T1JVmWfHwp

cvso1tUbJeLrMlhjg4Z8x38C

XmTsffB+q25IYuOWfHwp

ry8fNm8E0PgCFA==

Signatures

Formbook
Formbook is a data stealing malware which is capable of stealing data.
trojan spyware stealer formbook
Executes dropped EXE 1 IoCs

Processes:

fuwusylazeffuo.exe

pid process

1332 fuwusylazeffuo.exe

pid	process
1332	fuwusylazeffuo.exe

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

fuwusylazeffuo.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Control Panel\International\Geo\Nation	fuwusylazeffuo.exe

Loads dropped DLL 11 IoCs

Processes:

tmp.exefuwusylazeffuo.exefuwusylazeffuo.exeWerFault.exe

pid	process
1372	tmp.exe
1372	tmp.exe
1372	tmp.exe
1372	tmp.exe
1332	fuwusylazeffuo.exe
1532	fuwusylazeffuo.exe
924	WerFault.exe
924	WerFault.exe
924	WerFault.exe
924	WerFault.exe
924	WerFault.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

fuwusylazeffuo.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\dyhkboeiqg = "C:\\Users\\Admin\\AppData\\Roaming\\vhesmtdikvlglu\\avyvaajyo.exe"	fuwusylazeffuo.exe

Suspicious use of SetThreadContext 4 IoCs

Processes:

fuwusylazeffuo.exefuwusylazeffuo.exechkdsk.exe

description	pid	process	target process
PID 1332 set thread context of 1532	1332	fuwusylazeffuo.exe	fuwusylazeffuo.exe
PID 1532 set thread context of 1256	1532	fuwusylazeffuo.exe	Explorer.EXE
PID 1532 set thread context of 1256	1532	fuwusylazeffuo.exe	Explorer.EXE
PID 1008 set thread context of 1256	1008	chkdsk.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
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

924 1332 WerFault.exe fuwusylazeffuo.exe
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

pid	pid_target	process	target process
924	1332	WerFault.exe	fuwusylazeffuo.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-1-5-21-2292972927-2705560509-2768824231-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	chkdsk.exe

Suspicious behavior: EnumeratesProcesses 20 IoCs

Processes:

fuwusylazeffuo.exechkdsk.exe

pid	process
1532	fuwusylazeffuo.exe
1532	fuwusylazeffuo.exe
1532	fuwusylazeffuo.exe
1532	fuwusylazeffuo.exe
1532	fuwusylazeffuo.exe
1008	chkdsk.exe
1008	chkdsk.exe
1008	chkdsk.exe
1008	chkdsk.exe
1008	chkdsk.exe
1008	chkdsk.exe
1008	chkdsk.exe
1008	chkdsk.exe
1008	chkdsk.exe
1008	chkdsk.exe
1008	chkdsk.exe
1008	chkdsk.exe
1008	chkdsk.exe
1008	chkdsk.exe
1008	chkdsk.exe

Suspicious behavior: MapViewOfSection 8 IoCs

Processes:

fuwusylazeffuo.exechkdsk.exe

pid	process
1532	fuwusylazeffuo.exe
1532	fuwusylazeffuo.exe
1532	fuwusylazeffuo.exe
1532	fuwusylazeffuo.exe
1008	chkdsk.exe
1008	chkdsk.exe
1008	chkdsk.exe
1008	chkdsk.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

fuwusylazeffuo.exeExplorer.EXEchkdsk.exe

description pid process

Token: SeDebugPrivilege 1532 fuwusylazeffuo.exe
Token: SeShutdownPrivilege 1256 Explorer.EXE
Token: SeDebugPrivilege 1008 chkdsk.exe
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

Explorer.EXE

pid process

1256 Explorer.EXE
1256 Explorer.EXE
Suspicious use of SendNotifyMessage 2 IoCs

Processes:

Explorer.EXE

pid process

1256 Explorer.EXE
1256 Explorer.EXE

description	pid	process
Token: SeDebugPrivilege	1532	fuwusylazeffuo.exe
Token: SeShutdownPrivilege	1256	Explorer.EXE
Token: SeDebugPrivilege	1008	chkdsk.exe

pid	process
1256	Explorer.EXE
1256	Explorer.EXE

pid	process
1256	Explorer.EXE
1256	Explorer.EXE

Suspicious use of WriteProcessMemory 22 IoCs

Processes:

tmp.exefuwusylazeffuo.exefuwusylazeffuo.exechkdsk.exe

description	pid	process	target process
PID 1372 wrote to memory of 1332	1372	tmp.exe	fuwusylazeffuo.exe
PID 1372 wrote to memory of 1332	1372	tmp.exe	fuwusylazeffuo.exe
PID 1372 wrote to memory of 1332	1372	tmp.exe	fuwusylazeffuo.exe
PID 1372 wrote to memory of 1332	1372	tmp.exe	fuwusylazeffuo.exe
PID 1332 wrote to memory of 1532	1332	fuwusylazeffuo.exe	fuwusylazeffuo.exe
PID 1332 wrote to memory of 1532	1332	fuwusylazeffuo.exe	fuwusylazeffuo.exe
PID 1332 wrote to memory of 1532	1332	fuwusylazeffuo.exe	fuwusylazeffuo.exe
PID 1332 wrote to memory of 1532	1332	fuwusylazeffuo.exe	fuwusylazeffuo.exe
PID 1332 wrote to memory of 1532	1332	fuwusylazeffuo.exe	fuwusylazeffuo.exe
PID 1332 wrote to memory of 924	1332	fuwusylazeffuo.exe	WerFault.exe
PID 1332 wrote to memory of 924	1332	fuwusylazeffuo.exe	WerFault.exe
PID 1332 wrote to memory of 924	1332	fuwusylazeffuo.exe	WerFault.exe
PID 1332 wrote to memory of 924	1332	fuwusylazeffuo.exe	WerFault.exe
PID 1532 wrote to memory of 1008	1532	fuwusylazeffuo.exe	chkdsk.exe
PID 1532 wrote to memory of 1008	1532	fuwusylazeffuo.exe	chkdsk.exe
PID 1532 wrote to memory of 1008	1532	fuwusylazeffuo.exe	chkdsk.exe
PID 1532 wrote to memory of 1008	1532	fuwusylazeffuo.exe	chkdsk.exe
PID 1008 wrote to memory of 1648	1008	chkdsk.exe	Firefox.exe
PID 1008 wrote to memory of 1648	1008	chkdsk.exe	Firefox.exe
PID 1008 wrote to memory of 1648	1008	chkdsk.exe	Firefox.exe
PID 1008 wrote to memory of 1648	1008	chkdsk.exe	Firefox.exe
PID 1008 wrote to memory of 1648	1008	chkdsk.exe	Firefox.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:1256

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
2⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1372

C:\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe
"C:\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe"
3⤵
- Executes dropped EXE
- Loads dropped DLL
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1332

C:\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe
"C:\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe"
4⤵
- Checks computer location settings
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1532

C:\Windows\SysWOW64\chkdsk.exe
"C:\Windows\SysWOW64\chkdsk.exe"
5⤵
- Suspicious use of SetThreadContext
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1008

C:\Program Files\Mozilla Firefox\Firefox.exe
"C:\Program Files\Mozilla Firefox\Firefox.exe"
6⤵
PID:1648

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1332 -s 252
4⤵
- Loads dropped DLL
- Program crash
PID:924

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe
Filesize
56KB

MD5
ce262c598fed05331ed24e0d44fab549

SHA1
855a97836d6c47e7a4f6e9d702ac75adec755ea9

SHA256
ff821e285da8c69105815df6e9f2bd04ad88ebcc6b881f59e9592e5bd62e25c1

SHA512
8cd7b56cce82c801263546421db71815e84d2cd7894124761c2ce1ec49be28fa47e6751896a3aef1b0e21f2c4fef5c88d230f0b7fb7b0b67abc49bc1a3a5440c

Download Submit
C:\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe
Filesize
56KB

MD5
ce262c598fed05331ed24e0d44fab549

SHA1
855a97836d6c47e7a4f6e9d702ac75adec755ea9

SHA256
ff821e285da8c69105815df6e9f2bd04ad88ebcc6b881f59e9592e5bd62e25c1

SHA512
8cd7b56cce82c801263546421db71815e84d2cd7894124761c2ce1ec49be28fa47e6751896a3aef1b0e21f2c4fef5c88d230f0b7fb7b0b67abc49bc1a3a5440c

Download Submit
C:\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe
Filesize
56KB

MD5
ce262c598fed05331ed24e0d44fab549

SHA1
855a97836d6c47e7a4f6e9d702ac75adec755ea9

SHA256
ff821e285da8c69105815df6e9f2bd04ad88ebcc6b881f59e9592e5bd62e25c1

SHA512
8cd7b56cce82c801263546421db71815e84d2cd7894124761c2ce1ec49be28fa47e6751896a3aef1b0e21f2c4fef5c88d230f0b7fb7b0b67abc49bc1a3a5440c

Download Submit
C:\Users\Admin\AppData\Local\Temp\quhlzrpp.f
Filesize
172KB

MD5
cb9dbd9ff987c69b17f57f621c313e52

SHA1
db0b62eb1c07a346ac161c4e6b086255f0c4b213

SHA256
58b23d9622d97157ddb9cf7c1f4b89f694a4647f22ff238cc6b4ccc32c4ad024

SHA512
582d261962572be24972239f692bc65cd69b410dafbae550858a6d87986e978fafaf95a183449cdf82c9a64ce90a32db0a0267580259e00dc751c676c3776884

Download Submit
C:\Users\Admin\AppData\Local\Temp\wwpwcbjhcxl.uwe
Filesize
6KB

MD5
62a9b361c89112dcb9e46476b5f12331

SHA1
8ea7603b6d6db984351684b08ff52ce28a50d3e3

SHA256
66b19f4ba0ef9307c5da82840f3d85856cc852c96912ae4cb29944d30ea57538

SHA512
a7fa474a4963111984e423138bae5652b0f8726eddcf2af1cbdae8ff6ea346904ca93879ae6a291b9928af6b29ca00a2a1523465890725f81c64d134c0970e5e

Download Submit
\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe
Filesize
56KB

MD5
ce262c598fed05331ed24e0d44fab549

SHA1
855a97836d6c47e7a4f6e9d702ac75adec755ea9

SHA256
ff821e285da8c69105815df6e9f2bd04ad88ebcc6b881f59e9592e5bd62e25c1

SHA512
8cd7b56cce82c801263546421db71815e84d2cd7894124761c2ce1ec49be28fa47e6751896a3aef1b0e21f2c4fef5c88d230f0b7fb7b0b67abc49bc1a3a5440c

Download Submit
\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe
Filesize
56KB

MD5
ce262c598fed05331ed24e0d44fab549

SHA1
855a97836d6c47e7a4f6e9d702ac75adec755ea9

SHA256
ff821e285da8c69105815df6e9f2bd04ad88ebcc6b881f59e9592e5bd62e25c1

SHA512
8cd7b56cce82c801263546421db71815e84d2cd7894124761c2ce1ec49be28fa47e6751896a3aef1b0e21f2c4fef5c88d230f0b7fb7b0b67abc49bc1a3a5440c

Download Submit
\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe
Filesize
56KB

MD5
ce262c598fed05331ed24e0d44fab549

SHA1
855a97836d6c47e7a4f6e9d702ac75adec755ea9

SHA256
ff821e285da8c69105815df6e9f2bd04ad88ebcc6b881f59e9592e5bd62e25c1

SHA512
8cd7b56cce82c801263546421db71815e84d2cd7894124761c2ce1ec49be28fa47e6751896a3aef1b0e21f2c4fef5c88d230f0b7fb7b0b67abc49bc1a3a5440c

Download Submit
\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe
Filesize
56KB

MD5
ce262c598fed05331ed24e0d44fab549

SHA1
855a97836d6c47e7a4f6e9d702ac75adec755ea9

SHA256
ff821e285da8c69105815df6e9f2bd04ad88ebcc6b881f59e9592e5bd62e25c1

SHA512
8cd7b56cce82c801263546421db71815e84d2cd7894124761c2ce1ec49be28fa47e6751896a3aef1b0e21f2c4fef5c88d230f0b7fb7b0b67abc49bc1a3a5440c

Download Submit
\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe
Filesize
56KB

MD5
ce262c598fed05331ed24e0d44fab549

SHA1
855a97836d6c47e7a4f6e9d702ac75adec755ea9

SHA256
ff821e285da8c69105815df6e9f2bd04ad88ebcc6b881f59e9592e5bd62e25c1

SHA512
8cd7b56cce82c801263546421db71815e84d2cd7894124761c2ce1ec49be28fa47e6751896a3aef1b0e21f2c4fef5c88d230f0b7fb7b0b67abc49bc1a3a5440c

Download Submit
\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe
Filesize
56KB

MD5
ce262c598fed05331ed24e0d44fab549

SHA1
855a97836d6c47e7a4f6e9d702ac75adec755ea9

SHA256
ff821e285da8c69105815df6e9f2bd04ad88ebcc6b881f59e9592e5bd62e25c1

SHA512
8cd7b56cce82c801263546421db71815e84d2cd7894124761c2ce1ec49be28fa47e6751896a3aef1b0e21f2c4fef5c88d230f0b7fb7b0b67abc49bc1a3a5440c

Download Submit
\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe
Filesize
56KB

MD5
ce262c598fed05331ed24e0d44fab549

SHA1
855a97836d6c47e7a4f6e9d702ac75adec755ea9

SHA256
ff821e285da8c69105815df6e9f2bd04ad88ebcc6b881f59e9592e5bd62e25c1

SHA512
8cd7b56cce82c801263546421db71815e84d2cd7894124761c2ce1ec49be28fa47e6751896a3aef1b0e21f2c4fef5c88d230f0b7fb7b0b67abc49bc1a3a5440c

Download Submit
\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe
Filesize
56KB

MD5
ce262c598fed05331ed24e0d44fab549

SHA1
855a97836d6c47e7a4f6e9d702ac75adec755ea9

SHA256
ff821e285da8c69105815df6e9f2bd04ad88ebcc6b881f59e9592e5bd62e25c1

SHA512
8cd7b56cce82c801263546421db71815e84d2cd7894124761c2ce1ec49be28fa47e6751896a3aef1b0e21f2c4fef5c88d230f0b7fb7b0b67abc49bc1a3a5440c

Download Submit
\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe
Filesize
56KB

MD5
ce262c598fed05331ed24e0d44fab549

SHA1
855a97836d6c47e7a4f6e9d702ac75adec755ea9

SHA256
ff821e285da8c69105815df6e9f2bd04ad88ebcc6b881f59e9592e5bd62e25c1

SHA512
8cd7b56cce82c801263546421db71815e84d2cd7894124761c2ce1ec49be28fa47e6751896a3aef1b0e21f2c4fef5c88d230f0b7fb7b0b67abc49bc1a3a5440c

Download Submit
\Users\Admin\AppData\Local\Temp\fuwusylazeffuo.exe
Filesize
56KB

MD5
ce262c598fed05331ed24e0d44fab549

SHA1
855a97836d6c47e7a4f6e9d702ac75adec755ea9

SHA256
ff821e285da8c69105815df6e9f2bd04ad88ebcc6b881f59e9592e5bd62e25c1

SHA512
8cd7b56cce82c801263546421db71815e84d2cd7894124761c2ce1ec49be28fa47e6751896a3aef1b0e21f2c4fef5c88d230f0b7fb7b0b67abc49bc1a3a5440c

Download Submit
memory/924-68-0x0000000000000000-mapping.dmp

Download
memory/1008-84-0x0000000002220000-0x0000000002523000-memory.dmp

Filesize
3.0MB

Download
memory/1008-85-0x0000000000A10000-0x0000000000A9F000-memory.dmp

Filesize
572KB

Download
memory/1008-82-0x0000000000E10000-0x0000000000E17000-memory.dmp

Filesize
28KB

Download
memory/1008-83-0x00000000000C0000-0x00000000000EB000-memory.dmp

Filesize
172KB

Download
memory/1008-81-0x0000000000000000-mapping.dmp

Download
memory/1256-72-0x0000000006550000-0x000000000662F000-memory.dmp

Filesize
892KB

Download
memory/1256-80-0x0000000006A90000-0x0000000006B6D000-memory.dmp

Filesize
884KB

Download
memory/1256-86-0x0000000006B70000-0x0000000006CB7000-memory.dmp

Filesize
1.3MB

Download
memory/1256-87-0x0000000006B70000-0x0000000006CB7000-memory.dmp

Filesize
1.3MB

Download
memory/1332-59-0x0000000000000000-mapping.dmp

Download
memory/1372-54-0x00000000763F1000-0x00000000763F3000-memory.dmp

Filesize
8KB

Download
memory/1532-70-0x0000000000400000-0x000000000042B000-memory.dmp

Filesize
172KB

Download
memory/1532-78-0x0000000000400000-0x000000000042B000-memory.dmp

Filesize
172KB

Download
memory/1532-79-0x0000000000340000-0x0000000000350000-memory.dmp

Filesize
64KB

Download
memory/1532-71-0x0000000000080000-0x0000000000090000-memory.dmp

Filesize
64KB

Download
memory/1532-69-0x0000000000840000-0x0000000000B43000-memory.dmp

Filesize
3.0MB

Download
memory/1532-66-0x000000000041FEA0-mapping.dmp

Download