formbook | d8e71f4f6c001ff40cdc03fff232d097a103a4413b8e74ecb9a333b8a2d6a436

Analysis

max time kernel
148s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
27-01-2023 04:40

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General

Target

c5edcf43ecc797a13c565d436c6a541c.exe
Size

264KB
MD5

c5edcf43ecc797a13c565d436c6a541c
SHA1

19df4c73ad340f89c0748031416c5a7fb4f9dabf
SHA256

d8e71f4f6c001ff40cdc03fff232d097a103a4413b8e74ecb9a333b8a2d6a436
SHA512

60938330a1613f8f1c61aff387593feeba47a6f240bb0e1320876507e278b99de3e0c6bd66c33d7f2183d750b277e1300ab312de465add258effb3023c505117
SSDEEP

6144:/Ya6nNcpeTPip2Ooh4U/W4+GGqAShPgsewR+7CRh76vNBxwo:/YVW8iQVhvJ+GxAig7G+7CD70zwo

Score

10^/10

formbook xloader poub loader persistence rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Campaign

poub

Decoy

WY0eksfISzRg4O6c+opnGL6gaw==

moRjn9ExtYi8UmUo+Tya

2vME+GedoxzFnuLXesUoVj4=

EvW4JWJ1NQ8nN3tA3SM=

2mK9efMZMgN1VOs=

8d0jua5b0J6AQEW7

/2cyThOd37DSTYMASDye4Q0t/Vs=

ral+tbIh2KKAQEW7

YLY9jsPtYB/FRmMo+Tya

R1WcElWAMtFxFrVqtZT2ZpIS9xRZNho=

KFXGg/T1pCC9GjrxUPTcjw==

8mMlK5nDwjjPFTP5jMtAtQ0t/Vs=

c7am8nhhlCo=

UW91trZj6dENxuRdpxOvW1Cf

sjOMUcvq6lYJCZEfV4euFzY=

62nBgPjdmWQkmWElww==

64E8JqA1aruSUvw=

NqI1reXpcR+REye0

8+y1oOsbjgSyEhjXUPTcjw==

Rx9by8gNBwN1VOs=

Signatures

Formbook
Formbook is a data stealing malware which is capable of stealing data.
trojan spyware stealer formbook
Xloader
Xloader is a rebranded version of Formbook malware.
loader xloader

Xloader payload 3 IoCs

rat

Processes:

resource	yara_rule
behavioral2/memory/1116-139-0x0000000000400000-0x000000000042C000-memory.dmp	xloader
behavioral2/memory/3528-145-0x0000000000FB0000-0x0000000000FDC000-memory.dmp	xloader
behavioral2/memory/3528-150-0x0000000000FB0000-0x0000000000FDC000-memory.dmp	xloader

Executes dropped EXE 3 IoCs

Processes:

kyfhnzgx.exekyfhnzgx.exegnhdhrr58.exe

pid process

2676 kyfhnzgx.exe
1116 kyfhnzgx.exe
3856 gnhdhrr58.exe

pid	process
2676	kyfhnzgx.exe
1116	kyfhnzgx.exe
3856	gnhdhrr58.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:

kyfhnzgx.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	kyfhnzgx.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:

help.exe

description	ioc	process
Key created	\Registry\Machine\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run	help.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\DHUPDH-XEBMH = "C:\\Program Files (x86)\\T9r6hz\\gnhdhrr58.exe"	help.exe

Suspicious use of SetThreadContext 3 IoCs

Processes:

kyfhnzgx.exekyfhnzgx.exehelp.exe

description	pid	process	target process
PID 2676 set thread context of 1116	2676	kyfhnzgx.exe	kyfhnzgx.exe
PID 1116 set thread context of 2644	1116	kyfhnzgx.exe	Explorer.EXE
PID 3528 set thread context of 2644	3528	help.exe	Explorer.EXE

Drops file in Program Files directory 4 IoCs

Processes:

help.exeExplorer.EXE

description	ioc	process
File opened for modification	C:\Program Files (x86)\T9r6hz\gnhdhrr58.exe	help.exe
File opened for modification	C:\Program Files (x86)\T9r6hz	Explorer.EXE
File created	C:\Program Files (x86)\T9r6hz\gnhdhrr58.exe	Explorer.EXE
File opened for modification	C:\Program Files (x86)\T9r6hz\gnhdhrr58.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

4456 3856 WerFault.exe gnhdhrr58.exe

pid	pid_target	process	target process
4456	3856	WerFault.exe	gnhdhrr58.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

Processes:

help.exe

description	ioc	process
Key created	\Registry\User\S-1-5-21-4246620582-653642754-1174164128-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	help.exe

Suspicious behavior: EnumeratesProcesses 58 IoCs

Processes:

kyfhnzgx.exehelp.exe

pid	process
1116	kyfhnzgx.exe
1116	kyfhnzgx.exe
1116	kyfhnzgx.exe
1116	kyfhnzgx.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

Explorer.EXE

pid process

2644 Explorer.EXE
Suspicious behavior: MapViewOfSection 8 IoCs

Processes:

kyfhnzgx.exekyfhnzgx.exehelp.exe

pid process

2676 kyfhnzgx.exe
1116 kyfhnzgx.exe
1116 kyfhnzgx.exe
1116 kyfhnzgx.exe
3528 help.exe
3528 help.exe
3528 help.exe
3528 help.exe

pid	process
2644	Explorer.EXE

pid	process
2676	kyfhnzgx.exe
1116	kyfhnzgx.exe
1116	kyfhnzgx.exe
1116	kyfhnzgx.exe
3528	help.exe
3528	help.exe
3528	help.exe
3528	help.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

kyfhnzgx.exehelp.exeExplorer.EXE

description	pid	process
Token: SeDebugPrivilege	1116	kyfhnzgx.exe
Token: SeDebugPrivilege	3528	help.exe
Token: SeShutdownPrivilege	2644	Explorer.EXE
Token: SeCreatePagefilePrivilege	2644	Explorer.EXE

Suspicious use of WriteProcessMemory 25 IoCs

Processes:

c5edcf43ecc797a13c565d436c6a541c.exekyfhnzgx.exeExplorer.EXEhelp.exe

description	pid	process	target process
PID 4580 wrote to memory of 2676	4580	c5edcf43ecc797a13c565d436c6a541c.exe	kyfhnzgx.exe
PID 4580 wrote to memory of 2676	4580	c5edcf43ecc797a13c565d436c6a541c.exe	kyfhnzgx.exe
PID 4580 wrote to memory of 2676	4580	c5edcf43ecc797a13c565d436c6a541c.exe	kyfhnzgx.exe
PID 2676 wrote to memory of 1116	2676	kyfhnzgx.exe	kyfhnzgx.exe
PID 2676 wrote to memory of 1116	2676	kyfhnzgx.exe	kyfhnzgx.exe
PID 2676 wrote to memory of 1116	2676	kyfhnzgx.exe	kyfhnzgx.exe
PID 2676 wrote to memory of 1116	2676	kyfhnzgx.exe	kyfhnzgx.exe
PID 2644 wrote to memory of 3528	2644	Explorer.EXE	help.exe
PID 2644 wrote to memory of 3528	2644	Explorer.EXE	help.exe
PID 2644 wrote to memory of 3528	2644	Explorer.EXE	help.exe
PID 3528 wrote to memory of 3784	3528	help.exe	cmd.exe
PID 3528 wrote to memory of 3784	3528	help.exe	cmd.exe
PID 3528 wrote to memory of 3784	3528	help.exe	cmd.exe
PID 3528 wrote to memory of 2868	3528	help.exe	cmd.exe
PID 3528 wrote to memory of 2868	3528	help.exe	cmd.exe
PID 3528 wrote to memory of 2868	3528	help.exe	cmd.exe
PID 3528 wrote to memory of 2464	3528	help.exe	cmd.exe
PID 3528 wrote to memory of 2464	3528	help.exe	cmd.exe
PID 3528 wrote to memory of 2464	3528	help.exe	cmd.exe
PID 3528 wrote to memory of 480	3528	help.exe	Firefox.exe
PID 3528 wrote to memory of 480	3528	help.exe	Firefox.exe
PID 3528 wrote to memory of 480	3528	help.exe	Firefox.exe
PID 2644 wrote to memory of 3856	2644	Explorer.EXE	gnhdhrr58.exe
PID 2644 wrote to memory of 3856	2644	Explorer.EXE	gnhdhrr58.exe
PID 2644 wrote to memory of 3856	2644	Explorer.EXE	gnhdhrr58.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:2644

C:\Users\Admin\AppData\Local\Temp\c5edcf43ecc797a13c565d436c6a541c.exe
"C:\Users\Admin\AppData\Local\Temp\c5edcf43ecc797a13c565d436c6a541c.exe"
2⤵
- Suspicious use of WriteProcessMemory
PID:4580

C:\Users\Admin\AppData\Local\Temp\kyfhnzgx.exe
"C:\Users\Admin\AppData\Local\Temp\kyfhnzgx.exe" C:\Users\Admin\AppData\Local\Temp\guiaopyy.j
3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2676

C:\Users\Admin\AppData\Local\Temp\kyfhnzgx.exe
"C:\Users\Admin\AppData\Local\Temp\kyfhnzgx.exe"
4⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:1116

C:\Windows\SysWOW64\help.exe
"C:\Windows\SysWOW64\help.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:3528

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\kyfhnzgx.exe"
3⤵
PID:3784

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:2868

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:2464

C:\Program Files\Mozilla Firefox\Firefox.exe
"C:\Program Files\Mozilla Firefox\Firefox.exe"
3⤵
PID:480

C:\Program Files (x86)\T9r6hz\gnhdhrr58.exe
"C:\Program Files (x86)\T9r6hz\gnhdhrr58.exe"
2⤵
- Executes dropped EXE
PID:3856

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3856 -s 508
3⤵
- Program crash
PID:4456

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3856 -ip 3856
1⤵
PID:2572

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

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Exfiltration

Command and Control

Impact

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Downloads

C:\Program Files (x86)\T9r6hz\gnhdhrr58.exe
Filesize
81KB

MD5
85af329a0a06c1401e60a9c02d060948

SHA1
d83acc707040401fe1d88570608e8e8f05589944

SHA256
79d7f5eafd50ad73831ca1706f15d0c5e4c49f1586c1c67d8e8d593615282e1d

SHA512
f13fd7090a6014f6920926fd38ce582fbd7c1a9a201ee5e97fc9731e5d7943f53bd43e0dd7fafcdb2b8004c48ec53144e41d754be814850c34dfa15e8ea69b66

Download Submit
C:\Program Files (x86)\T9r6hz\gnhdhrr58.exe
Filesize
81KB

MD5
85af329a0a06c1401e60a9c02d060948

SHA1
d83acc707040401fe1d88570608e8e8f05589944

SHA256
79d7f5eafd50ad73831ca1706f15d0c5e4c49f1586c1c67d8e8d593615282e1d

SHA512
f13fd7090a6014f6920926fd38ce582fbd7c1a9a201ee5e97fc9731e5d7943f53bd43e0dd7fafcdb2b8004c48ec53144e41d754be814850c34dfa15e8ea69b66

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\guiaopyy.j
Filesize
5KB

MD5
7dd82af1732e277c64b7f580fb68b3f8

SHA1
7f1cac07464b57d03eeba50d4371a6fbcaff1798

SHA256
237438a1c80ff20bb45e9a0b804322f2a3527f849bef2aaf406d18c189a44c0b

SHA512
0a675216d4e0a03165c3f3d11cd3d125b31624d93e4a901799b3066e691fc7dbf81aed86bea23e3167d230d880682c814b77e219f471ad770a43a28a1d496207

Download Submit
C:\Users\Admin\AppData\Local\Temp\kyfhnzgx.exe
Filesize
81KB

MD5
85af329a0a06c1401e60a9c02d060948

SHA1
d83acc707040401fe1d88570608e8e8f05589944

SHA256
79d7f5eafd50ad73831ca1706f15d0c5e4c49f1586c1c67d8e8d593615282e1d

SHA512
f13fd7090a6014f6920926fd38ce582fbd7c1a9a201ee5e97fc9731e5d7943f53bd43e0dd7fafcdb2b8004c48ec53144e41d754be814850c34dfa15e8ea69b66

Download Submit
C:\Users\Admin\AppData\Local\Temp\kyfhnzgx.exe
Filesize
81KB

MD5
85af329a0a06c1401e60a9c02d060948

SHA1
d83acc707040401fe1d88570608e8e8f05589944

SHA256
79d7f5eafd50ad73831ca1706f15d0c5e4c49f1586c1c67d8e8d593615282e1d

SHA512
f13fd7090a6014f6920926fd38ce582fbd7c1a9a201ee5e97fc9731e5d7943f53bd43e0dd7fafcdb2b8004c48ec53144e41d754be814850c34dfa15e8ea69b66

Download Submit
C:\Users\Admin\AppData\Local\Temp\kyfhnzgx.exe
Filesize
81KB

MD5
85af329a0a06c1401e60a9c02d060948

SHA1
d83acc707040401fe1d88570608e8e8f05589944

SHA256
79d7f5eafd50ad73831ca1706f15d0c5e4c49f1586c1c67d8e8d593615282e1d

SHA512
f13fd7090a6014f6920926fd38ce582fbd7c1a9a201ee5e97fc9731e5d7943f53bd43e0dd7fafcdb2b8004c48ec53144e41d754be814850c34dfa15e8ea69b66

Download Submit
C:\Users\Admin\AppData\Local\Temp\lufvp.o
Filesize
196KB

MD5
a69fcb977745da1e8892aed65f6a5a89

SHA1
32b35f70fc0d3686ea4ffc26f70c80a8ede70474

SHA256
108668a80bdff8cc56a95903d011d86410054cadbd4f52530a0ff9f4c0f0e24b

SHA512
21badfef569bfebcabf03ef5ab6061b4c723b241ccf69ff67ad5649ee1dda08b1bb99f43de0b43687841274356dafbe67a799c4cead6dd15309845c253e6a508

Download Submit
memory/1116-140-0x0000000000BD0000-0x0000000000F1A000-memory.dmp

Filesize
3.3MB

Download
memory/1116-141-0x00000000005B0000-0x00000000005C1000-memory.dmp

Filesize
68KB

Download
memory/1116-139-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/1116-137-0x0000000000000000-mapping.dmp

Download
memory/2464-154-0x0000000000000000-mapping.dmp

Download
memory/2644-142-0x00000000030B0000-0x00000000031A5000-memory.dmp

Filesize
980KB

Download
memory/2644-151-0x0000000008610000-0x000000000871A000-memory.dmp

Filesize
1.0MB

Download
memory/2644-149-0x0000000008610000-0x000000000871A000-memory.dmp

Filesize
1.0MB

Download
memory/2676-132-0x0000000000000000-mapping.dmp

Download
memory/2868-152-0x0000000000000000-mapping.dmp

Download
memory/3528-144-0x0000000000280000-0x0000000000287000-memory.dmp

Filesize
28KB

Download
memory/3528-150-0x0000000000FB0000-0x0000000000FDC000-memory.dmp

Filesize
176KB

Download
memory/3528-148-0x00000000016F0000-0x0000000001780000-memory.dmp

Filesize
576KB

Download
memory/3528-147-0x0000000001880000-0x0000000001BCA000-memory.dmp

Filesize
3.3MB

Download
memory/3528-145-0x0000000000FB0000-0x0000000000FDC000-memory.dmp

Filesize
176KB

Download
memory/3528-143-0x0000000000000000-mapping.dmp

Download
memory/3784-146-0x0000000000000000-mapping.dmp

Download
memory/3856-156-0x0000000000000000-mapping.dmp

Download